Feasibility and reliability of a mobile tool to evaluate exposure to tobacco product marketing and messages using ecological momentary assessment

Recall of Netflix Scripted Content Known to Contain E-Cigarette-Related Imagery is Associated with Susceptibility to Use E-Cigarettes Among Young Adults

INTRODUCTION

Netflix pledged to avoid depictions of e-cigarette use in scripted series and movies rated TV-14 or below. However, this policy did not extend to young adults, many of whom are below the legal tobacco purchasing age. This study examined the association between recall of Netflix scripted series and movies previously identified to contain e-cigarette imagery and susceptibility to use e-cigarettes among never users.

MATERIALS AND METHODS

A non-probability representative sample of young adults (ages 18-24; N = 1500) living in California were recruited to complete an online survey assessing their recall of Netflix scripted series and movies previously identified to contain e-cigarette imagery and e-cigarette-related behaviors. Adjusted and weighted logistic regression analyses were used among participants who had never used e-cigarettes (n = 967).

RESULTS

Among participants who had never used e-cigarettes, 68.1% (n = 659/967) recalled viewing at least one Netflix scripted series or movie previously identified to contain e-cigarette imagery, including 66.4% (n = 192/289) of participants under the legal tobacco purchasing age. Participants who recalled viewing at least one Netflix scripted series or movie previously identified to contain e-cigarette imagery, compared with those who did not, had greater odds of reporting susceptibility to use e-cigarettes among never users (AOR = 1.65, 95% CI = 1.20-2.25).

CONCLUSIONS

Young adults living in California recalled Netflix scripted series or movies previously identified to contain e-cigarette imagery. Such recall was associated with susceptibility to use e-cigarettes among never users. These findings should motivate prevention programmers to design tobacco-related digital media literacy interventions for young adults.

Causal effects of point-of-sale cigarette promotions and subjective social status on cigarette craving: a randomised within-person experiment

BACKGROUND

Cigarette smoking continues to be a leading cause of preventable deaths in the USA, in part because the USA has not adopted the WHO Framework Convention on Tobacco Control. One way the tobacco industry counteracts tobacco control policies is by heavily advertising cigarettes at the point of sale in retailers (eg, at the cash register) and by offering discounts on cigarettes.

DESIGN

A within-subject experimental design with adults who smoke cigarettes daily (n=281) investigated whether: (1) exposure to images of cigarette promotions in an online experiment is associated with greater cigarette craving relative to viewing images of non-smoking cues, and (2) if exposure to images of point-of-sale cigarette promotions with a discount (vs without) increases cigarette craving. The study also examined how participants' subjective social status (compared with others in the USA) relates to cigarette craving after exposure to images of cigarette promotions with and without a discount.

RESULTS

In an online experiment, exposure to images of smoking cues, including point-of-sale cigarette promotions, elicited greater craving relative to non-smoking cues (all p<0.001). In addition, images of promotions with a discount elicited higher levels of craving compared with those without a discount (b=0.09, p=0.001). Although participants with a higher (vs lower) subjective social status craved cigarettes less overall (b=-0.12, p=0.012), there was no difference in their craving between images of promotions with and without a discount, while craving was higher for images of promotions with a discount than without for participants with higher subjective social status (b=0.06, p=0.021).

CONCLUSION

Viewing images of point-of-sale cigarette promotions can causally increase cravings to smoke, which may also apply to real-world retail settings that display cigarette promotions. Restricting point-of-sale promotions generally, and discounts specifically, could help reduce cigarette smoking and address tobacco use disparities in the USA.

Testing if attitudes mediate the association between advertising exposure and adolescent tobacco use

INTRODUCTION

A growing body of evidence indicates that exposure to tobacco advertising among adolescents increases the likelihood of subsequent tobacco use. It is important to understand the process by which this occurs, in order to appropriately target factors for intervention. The objective of this study was to test whether attitudes towards tobacco advertising mediates the impact of advertising exposure on tobacco use.

METHODS

From an ongoing prospective cohort study of male adolescents (aged 11-16 at baseline), we recruited a subset of tobacco users and non-users to participate in an additional ecological momentary assessment (EMA) project (N = 164). Adolescents completed smartphone-based surveys 2-3 times/day over a 10-day period with items assessing their exposures and attitudes towards tobacco-related advertising. If participants reported exposure to tobacco advertising, they were asked about their attitudes toward it (how much they enjoyed it, liked it, and found it appealing).

RESULTS

Adolescents who reported a greater amount of advertising exposure during the EMA period were more likely to report past-30-day tobacco use at their next cohort follow-up (6-12 months later). Moreover, the impact of advertising exposure on subsequent use was mediated by attitudes toward the tobacco advertisements, as reported during the EMA. This effect remained after controlling for baseline tobacco use.

CONCLUSIONS

By pairing EMA with long-term follow-up, we identified attitudes as a mediator between adolescent advertising exposure and subsequent tobacco use. Interventions to lessen adolescents' positive attitudes toward tobacco advertisements may help disrupt this impact.

Real-Time Context of Tobacco Marketing Exposure and Community Vulnerability-An Ecological Momentary Assessment Among Young Adults

BACKGROUND

Exposure to tobacco product marketing increases tobacco use among young adults, especially those from vulnerable communities (VCs).

PURPOSE

This study examined real-time tobacco marketing exposure among young adults from vulnerable and non-vulnerable communities using Ecological Momentary Assessment (EMA).

METHODS

This study used EMA data to assess context (e.g., location and activity) of tobacco marketing exposure using four text-messaging surveys per day over 2 weeks. Young adult non-current tobacco users living in Washington, D.C. (n = 146; ages 18-24) recorded 5,285 surveys, including 20 participants (13.2%) from VCs with high proportions of lower income and racial/ethnic minorities, and high smoking rates. Unadjusted and adjusted multilevel logistic regressions were used to assess the associations between exposure to any and flavored tobacco marketing, VC residence, and real-time context.

RESULTS

Fifty-nine participants (40.4%) reported at least one tobacco marketing exposure and recorded 94 exposure moments. In adjusted models, odds of exposure were higher among VC residents (AOR = 2.6, 95% CI = 1.2-5.4), in the presence of anyone using tobacco versus no use (AOR = 4.0, 95% CI = 2.4-6.7), at store/retail (AOR = 17.0, 95% CI = 6.4-44.8), or outside/in transit (AOR = 4.1, 95% CI = 2.1-7.8) versus at home. VC residence (AOR = 7.2, 95% CI = 2.3-22.2) was the strongest predictor of flavored tobacco marketing exposure among all covariates examined.

CONCLUSIONS

Young adults are predominantly exposed to tobacco marketing in their daily lives through retail advertisements. Young adults from VCs are at increased risks of seeing any tobacco and especially flavored tobacco marketing. Policies that curtail tobacco retailer density and advertisement displays may reduce overall and differential tobacco marketing exposure.

Tobacco messages encountered in real-time among low socio-economic position groups: a descriptive study

BACKGROUND

Tobacco advertising disproportionately targets low socio-economic position (SEP) groups, causing higher rates of tobacco use in this population. Anti-tobacco public health education campaigns persuade against use. This study measured real-time exposure of pro- and anti-tobacco messages from low SEP groups in two American cities.

METHODS

Individuals in low SEP groups (N = 95), aged 18-34 years old, who were smokers and non-smokers, from the Boston and Houston areas, took part in a mobile health study. They submitted images of tobacco-related messages they encountered via a mobile application for a 7-week period. Two coders analyzed the images for message characteristics. Intercoder reliability was established using Krippendorff's alpha and data were analyzed descriptively.

RESULTS

Of the submitted images (N = 131), 83 were pro-tobacco and 53 were anti-tobacco. Of the pro-tobacco messages, the majority were cigarette ads (80.7%) seen outside (36.1%) or inside (30.1%) a convenience store or gas station and used conventional themes (e.g., price promotion; 53.2%). Of the anti-tobacco messages, 56.6% were sponsored by public health campaigns or were signage prohibiting smoking in a public area (39.6%). Most focused on the health harms of smoking (28.3%).

CONCLUSION

Low SEP groups in this study encountered more pro-tobacco than anti-tobacco messages at places that were point-of-sale using price promotions to appeal to this group. Anti-tobacco messages at point-of-sale and/or advertising regulations may help combat tobacco use.

Electronic Cigarette Product Placement and Imagery in Popular Music Videos

INTRODUCTION

Given the increasing use of electronic cigarettes (e-cigarettes) among young adults, it is crucial to identify possible sources of e-cigarette marketing exposure in media popular among young adults. However few studies document e-cigarette product placement (eg, visible logo, branded merchandise or gear such as a branded hat or shirt) in music videos. The objective of this study was to determine the extent of e-cigarette product placement and imagery in popular music videos.

METHODS

Songs on the Billboard Hot 100 list during the weeks of June 16 through September 22, 2018 with official music videos were identified (n = 180) and coded for e-cigarette product placement and imagery (including aerosol clouds), visible brand names, number of views (as of October 25, 2018), music genre, video themes, and combustible tobacco content.

RESULTS

E-cigarette product placement and imagery appeared in 7 (3.8%) music videos which were viewed over a billion times, providing billions of e-cigarette impressions. Among music videos with e-cigarette product placement and imagery, the most prevalent theme was Image/Lifestyle/Sociability (eg, ostentatious lifestyle, partying) and the most prevalent genre was Hip Hop. The e-cigarette companies KandyPens and Mig Vapor were identified.

CONCLUSION

While e-cigarette product placement or imagery appeared in a relatively low number of music videos in this study, these videos received views in the billions. Music videos should be considered when assessing e-cigarette marketing exposure among priority populations. Future research should examine how viewing e-cigarette product placement and imagery in music videos influences susceptibility to use such products among young adults.

IMPLICATIONS

While e-cigarette product placement (eg, scenes with visible branding, a visible logo, branded merchandise or gear such as a branded hat or shirt) or imagery appeared in a relatively low number of popular music videos in this study, these videos received views in the billions on YouTube. KandyPens and Mig Vapor were the companies responsible for the majority of the product placement identified in this study. The predominant music genre of videos featuring any e-cigarette product placement or imagery was Hip Hop, while the predominant theme of videos was Image/Lifestyle/Sociability. Music videos appear to be a potential source of exposure to e-cigarette products. Future research should examine how viewing e-cigarette product placement and imagery in music videos influences susceptibility to use such products among priority populations.

A comparison of self-reported exposure to fast food and sugary drinks marketing among parents of children across five countries

Exposure to unhealthy food and beverage marketing is an important environmental determinant of dietary intake. The current study examined self-reported exposure to marketing of unhealthy foods and beverages across various media channels and settings among parents of children younger than 18 years in five high and upper-middle income countries. Data from 4827 parents living with their children were analyzed from the International Food Policy Study (2017), a web-based survey of adults aged 18-64 years from Canada, the United States (US), the United Kingdom (UK), Australia, and Mexico. Respondents reported their exposure to marketing of fast food and of sugary drinks across media channels/settings overall and how often they see fast food and sugary drink marketing while viewing media with their children. Regression models examined differences across countries and correlates of marketing exposure. Parents in Mexico and the US reported greater exposure to marketing for fast food and sugary drinks compared to parents in Australia, Canada, and the UK. Patterns of exposure among parents were generally consistent across countries, with TV, digital media, and radio being the most commonly reported media channels for both fast food and sugary drinks. Exposure to marketing of fast food and sugary drinks was associated with a variety of sociodemographic factors, most strongly with ethnicity and education, and sociodemographic trends differed somewhat between countries. The findings demonstrate differences in self-reported parental exposure to marketing of fast food and sugary drinks between countries, and may help to evaluate the impact of marketing restrictions implemented over time.

Assessing Young Adults' ENDS Use via Ecological Momentary Assessment and a Smart Bluetooth Enabled ENDS Device

INTRODUCTION

The assessment of electronic nicotine delivery systems (ENDS) use poses unique challenges that go beyond established assessment methods for tobacco cigarettes. Recent studies have proposed using ecological momentary assessment (EMA), a method to collect self-reported data on mobile devices, or data passively collected by "smart" Bluetooth enabled ENDS to assess use. The current study sought to compare ENDS use data using EMA and puff counts collected from a smart device.

AIMS AND METHODS

We recruited 18 young adult ENDS users (age M = 23.33; 44.4% female) from the San Francisco Bay Area. For a total of 30 days, participants completed daily diaries by EMA and used a second-generation smart Bluetooth enabled ENDS that collected puff data. Repeated measures correlations, multilevel regressions, and paired t tests assessed concordance of EMA reports and ENDS data. A subset of four highly compliant participants were selected for sensitivity analyses.

RESULTS

Among all 18 participants, completion of EMA daily diaries was high (77.4%). The ENDS device collected approximately twice as many puffs per day as participants reported. Compared with self-reported number of sessions and amount of e-liquid used, self-reported puff counts had the highest correlation with device-collected puff counts (rrm = 0.49; p < .001). Correlations between self-reported and device-collected puff counts improved among the subset of four highly compliant participants (rrm = 0.59; p < .001).

CONCLUSIONS

Self-reports potentially underestimate use of ENDS. Puff counts appear to be the best self-reported measure to assess ENDS use compared with number of sessions or liquid volume.

IMPLICATIONS

The comparison of EMA self-reports and passively collected ENDS device data can inform future efforts to assess ENDS use. Self-reported puff counts are preferable over number of sessions or amount of liquid used, but compared with objective usage data, self-reported puff counts may still underestimate actual use. ENDS use behavior is likely higher than users estimate and report. Future research on improved measures of ENDS use is needed.

Associations Between Exposure to The Real Cost Campaign, Pro-Tobacco Advertisements, and Tobacco Use Among Youth in the U.S

INTRODUCTION

E-cigarette use is rising among youth. Advertising and anti-tobacco campaigns may be associated with the use of E-cigarettes and other tobacco products. This study examines the associations between tobacco use and exposure to The Real Cost's first campaign focusing on E-cigarettes.

METHODS

Using the 2019 National Youth Tobacco Survey, a national survey of middle and high school students, the associations between exposure to The Real Cost anti-tobacco campaign, exposure to pro-tobacco advertising, and the use of tobacco products in the past 30 days (exclusive E-cigarettes, exclusive other tobacco use, and dual/poly use of E-cigarettes and other tobacco products) was examined. Other tobacco included anything but E-cigarettes.

RESULTS

Participants (N=13,165) were aged 11-17 years. Exposure to The Real Cost campaign was associated with decreased odds of using other tobacco products (AOR=0.60, 95% CI=0.43, 0.84) and dual/poly use (AOR=0.77, 95% CI=0.63, 0.94) but not E-cigarette use. Greater E-cigarette advertising exposure was associated with increased odds of being an exclusive E-cigarette user (AOR=1.90, 95% CI=1.52, 2.30) or dual/poly user (AOR=1.69, 95% CI=1.31, 2.18). Greater exposure to other tobacco advertising was associated with increased odds of being a dual/poly user (AOR=1.32, 95% CI=1.01, 1.71) but lower odds of exclusive E-cigarette use (AOR=0.76, 95% CI=0.60, 0.97).

CONCLUSIONS

Exposure to The Real Cost campaign was associated with decreased odds of using other tobacco products and dual/poly products. Exposure to pro-tobacco advertising was also associated with use. Future studies should assess the long-term effectiveness of anti-tobacco messaging.

Research on Youth and Young Adult Tobacco Use, 2013-2018, From the Food and Drug Administration-National Institutes of Health Tobacco Centers of Regulatory Science

The Tobacco Regulatory Science Program is a collaborative research effort between the National Institutes of Health (NIH) and the Food and Drug Administration (FDA). In 2013, the NIH funded 14 Tobacco Centers of Regulatory Science (TCORS), which serve as partners in establishing research, training, and professional development programs to guide FDA. Each of the fourteen TCORS, and two other NIH-funded research programs, the Center for the Evaluation of Nicotine in Cigarettes (CENIC) and the Consortium on Methods Evaluating Tobacco (COMET), pursued specific research themes relevant to FDA's priorities. A key mandate for FDA is to reduce tobacco use among young people. This article is a review of the peer-reviewed research, including published and in-press manuscripts, from the TCORS, CENIC, and COMET, which provides specific data or other findings on youth (ages 10-18 years) and/or young adults (ages 18-34 years), from 2013 to 2018. Citations of all TCORS, CENIC, and COMET articles from September 2013 to December 2017 were collected by the TCORS coordinating center, the Center for Evaluation and Coordination of Training and Research. Additional citations up to April 30, 2018 were requested from the principal investigators. A scoring rubric was developed and implemented to assess study type, primary theme, and FDA priority area addressed by each article. The major subareas and findings from each priority area are presented. There were 766 articles in total, with 258 (34%) focusing on youth and/or young adults. Findings relevant to FDA from this review concern impact analysis, toxicity, health effects, addiction, marketing influences, communications, and behavior.

IMPLICATIONS

The Tobacco Centers of Regulatory Science, CENIC, and COMET have had a high output of scientific articles since 2013. These Centers are unique in that the FDA supports science specifically to guide future regulatory actions. The 258 articles that have focused on youth and/or young adults are providing data for regulatory actions by the FDA related to the key priority areas such as the addictiveness of non-cigarette products, the effects of exposure to electronic cigarette marketing on initiation and cessation, and the impact of flavored products on youth and young adult tobacco use. Future regulations to reduce tobacco use will be guided by the cumulative evidence. These Centers are one innovative mechanism to promote important outcomes to advance tobacco regulatory science.

Marketing Exposure Recall is Associated With Past 30-Day Single, Dual, Polytobacco Use Among US Adolescents

Introduction

This study assesses the relationship between tobacco/e-cigarette marketing exposure and single, dual, and polytobacco product use, among adolescents. Given the increased use of noncigarette tobacco products (eg, cigars, e-cigarettes, hookah) among youth, it is imperative to understand if marketing exposure is associated with dual and polytobacco product use.

Methods

Data were obtained from the 2014 National Youth Tobacco Survey and weighted to be representative of US middle and high school students. Multivariable multinomial logistic regression models were used to assess the relationships between product marketing (via internet, print, retail, and TV/movies) and past 30-day single, dual, and poly (three or more) tobacco product use. Three analyses were conducted using different categories as referent groups to allow for comprehensive examination of the relationships between all groups.

Results

Marketing exposure was significantly correlated with a greater risk of single, dual, and polytobacco product use relative to nonusers. Relative to single product users, product marketing exposure was significantly correlated with a greater relative risk of dual and polytobacco use. There was no statistical difference in the association of marketing exposure between dual and polytobacco use, in any model.

Conclusion

A positive relationship between tobacco product marketing exposure and number of tobacco products used was observed. The magnitude of the relationship grew from single product to dual/poly use. Restrictions of marketing of all tobacco products, similar to cigarettes, particularly in the retail setting, should be considered.

Implications

This study has two primary public health implications. First, self-reported exposure to tobacco/e-cigarette marketing is widespread among adolescents of all tobacco product categories. Second, this widespread exposure to tobacco/e-cigarette marketing appears to not only be correlated with use of a single tobacco product (eg, cigarettes, e-cigarettes), but also multiple tobacco products. While longitudinal studies are needed to further investigate the relationships observed in this study, findings justify further study given the known relationship between tobacco marketing exposure and subsequent cigarette use.

The magnitude and impact of tobacco marketing exposure in adolescents' day-to-day lives: An ecological momentary assessment (EMA) study

PURPOSE

Research indicates that tobacco marketing contributes to higher pro-tobacco attitudes and behaviors among adolescents, but no studies have been able to assess the impact of real-world tobacco marketing exposures in real-time. The purpose of this study was to examine the magnitude and impact of tobacco marketing exposure on adolescents using ecological momentary assessment (EMA). Our primary hypotheses were that (1) youth would most frequently report tobacco marketing at the retail points-of-sale and (2) greater exposures to tobacco marketing would be associated with more favorable tobacco-related attitudes, use, and expectancies.

METHODS

Participants were adolescent males from rural and urban Ohio (N = 176, ages 11-16). For ten days, these adolescents were prompted at two-three random times/day to complete a brief smartphone-based survey about their exposures and responses to tobacco-related advertising.

RESULTS

Adolescents reported exposures to tobacco marketing an average of 1.9 times over the 10-day EMA period, with over 10% seeing a tobacco advertisement 5 or more times. Reports of marketing exposures occurred most frequently at the point-of-sale; exposures were higher among tobacco users and rural adolescents. Consistent with hypotheses, marketing exposure was related to more positive attitudes to the tobacco advertisements, more tobacco use, and higher expectancies to use in the future.

CONCLUSIONS

Overall, these findings signal the magnitude of tobacco marketing exposures and their pernicious impact on youth. Findings underscore the importance of federal, state, and local-level tobacco regulatory policies to protect youth from the marketing that puts them at risk for a lifetime of nicotine addiction and tobacco-related diseases.

Using mHealth to Increase Treatment Utilization Among Recently Incarcerated Homeless Adults (Link2Care): Protocol for a Randomized Controlled Trial

Background

There is a significant revolving door of incarceration among homeless adults. Homeless adults who receive professional coordination of individualized care (ie, case management) during the period following their release from jail experience fewer mental health and substance use problems, are more likely to obtain stable housing, and are less likely to be reincarcerated. This is because case managers work to meet the various needs of their clients by helping them to overcome barriers to needed services (eg, food, clothing, housing, job training, substance abuse and mental health treatment, medical care, medication, social support, proof of identification, and legal aid). Many barriers (eg, limited transportation, inability to schedule appointments, and limited knowledge of available services) prevent homeless adults who were recently released from incarceration from obtaining available case management, crisis management, substance abuse, and mental health services.

Objective

The aim of the Link2Care study is to assess the effectiveness of a smartphone app for increasing case management and treatment service utilization, and in turn reduce homelessness and rearrest. The goals of this research are to (1) assess the impact of an innovative smartphone app that will prompt and directly link recently incarcerated homeless adults to community-based case management services and resources and (2) utilize in-person and smartphone-based assessments to identify key variables (eg, alcohol or drug use, social support, psychological distress, and quality of life) that predict continued homelessness and rearrest.

Methods

Homeless adults (N=432) who enroll in a shelter-based Homeless Recovery Program after release from the Dallas County Jail will be randomly assigned to one of the three treatment groups: (1) usual case management, (2) usual case management plus smartphone, and (3) usual case management with a study-provided smartphone that is preloaded with an innovative case management app (smartphone-based case management). Those assigned to smartphone-based case management will receive smartphones that prompt (twice weekly) connections to shelter-based case managers. The app will also offer direct links to case managers (available during normal business hours) and crisis interventionists (available 24 hours a day, 7 days a week) with the touch of a button.

Results

Recruitment began in the spring of 2018, and data collection will conclude in 2021.

Conclusions

This research represents an important step toward integrated service connection and health care service provision for one of the most underserved, high need, and understudied populations in the United States.

Trial Registration

ClinicalTrials.gov NCT03399500; https://clinicaltrials.gov/ct2/show/NCT03399500 (Archived by WebCite at http://www.webcitation.org/6zSJwdgUS)

Registered Report Identifier

RR1-10.2196/9868

Real Time Assessment of Young Adults' Attitudes toward Tobacco Messages

Objectives

We used ecological momentary assessment (EMA) to examine young adults' attitudes towards pro-tobacco messages encountered in real time and their association with intentions to use tobacco.

Methods

Young adults (N = 92, ages 18-29) recorded sightings of marketing or social media related to tobacco in real time via mobile app for 28 days. Participants reported message characteristics, their attitudes towards the message, and intentions to use the depicted product for each submission. We used generalized linear mixed models to examine factors related to attitude towards message and intentions to use tobacco.

Results

Messages depicting e-cigarettes (p < .001) or hookah (p < .05) were associated with significantly more favorable attitudes compared with traditional cigarettes. Positive attitude towards the message was significantly associated with intention to use the depicted product (p < .001). Messages depicting e-cigarettes and hookah were significantly associated with higher intention to use. Message source was not significantly related to attitudes towards the message or product use intentions.

Conclusions

Marketing featuring e-cigarettes and hookah is an important target for future regulation. Given that pro-tobacco and e-cigarette messages are prevalent online, future research should consider the Internet and social media as important venues for counter-marketing and intervention efforts.

Detecting Smoking Events Using Accelerometer Data Collected Via Smartwatch Technology: Validation Study

BACKGROUND

Smoking is the leading cause of preventable death in the world today. Ecological research on smoking in context currently relies on self-reported smoking behavior. Emerging smartwatch technology may more objectively measure smoking behavior by automatically detecting smoking sessions using robust machine learning models.

OBJECTIVE

This study aimed to examine the feasibility of detecting smoking behavior using smartwatches. The second aim of this study was to compare the success of observing smoking behavior with smartwatches to that of conventional self-reporting.

METHODS

A convenience sample of smokers was recruited for this study. Participants (N=10) recorded 12 hours of accelerometer data using a mobile phone and smartwatch. During these 12 hours, they engaged in various daily activities, including smoking, for which they logged the beginning and end of each smoking session. Raw data were classified as either smoking or nonsmoking using a machine learning model for pattern recognition. The accuracy of the model was evaluated by comparing the output with a detailed description of a modeled smoking session.

RESULTS

In total, 120 hours of data were collected from participants and analyzed. The accuracy of self-reported smoking was approximately 78% (96/123). Our model was successful in detecting 100 of 123 (81%) smoking sessions recorded by participants. After eliminating sessions from the participants that did not adhere to study protocols, the true positive detection rate of the smartwatch based-detection increased to more than 90%. During the 120 hours of combined observation time, only 22 false positive smoking sessions were detected resulting in a 2.8% false positive rate.

CONCLUSIONS

Smartwatch technology can provide an accurate, nonintrusive means of monitoring smoking behavior in natural contexts. The use of machine learning algorithms for passively detecting smoking sessions may enrich ecological momentary assessment protocols and cessation intervention studies that often rely on self-reported behaviors and may not allow for targeted data collection and communications around smoking events.