Prevention of tobacco use in adolescents: review of current findings and implications for healthcare providers

Evaluation of a school-based, experiential-learning smoking prevention program in promoting attitude change in adolescents

INTRODUCTION

School-based tobacco control programs exhibit great variety. Our study aimed to evaluate the effectiveness of an experiential learning smoking prevention program in facilitating knowledge acquisition, forging healthy attitudes, and decreasing intention to smoke.

METHODS

A school-based intervention-control study was implemented during the 2016–2017 academic year among middle-school students in Athens, Greece. The experiential learning intervention was delivered using an interdisciplinary approach, bridging excerpts from ancient classical Greek myths, Aesop fables and ancient classical literature (Aristotle, Herodotus, Plutarch, Xenophon, Homer’s Epics), with their decoded archetypal symbols applied in a smoking and tobacco control paradigm. An anonymous self-administered questionnaire was used at baseline and at follow-up at 3 months to evaluate program effectiveness.

RESULTS

A total of 351 students participated in our study; 181 (51.6%) in the intervention group and 170 (48.4%) in the control group. The mean age of student participants was 13 years (SD=0.96). Students in the intervention group were more likely to improve their knowledge of the adverse effects of smoking, develop attitudes against smoking and report a negative intention to smoke in the first year following the intervention, compared to the control group.

CONCLUSIONS

This study provides evidence that school-based experiential learning smoking prevention programs improve smoking-related knowledge, enhance anti-smoking attitudes and reinforce negative intentions toward tobacco products.

Relative Reduction in Prevalence (RRP): An Alternative to Cohen's Effect Size Statistics for Judging Alcohol, Cigarette, and Marijuana Use Prevention Outcomes

Jacob Cohen developed two statistical measures for judging the magnitude of effects produced by an intervention, known as Cohen's d, appropriate for assessing scaled data, and Cohen's h, appropriate for assessing proportions. These have been widely employed in evaluating the effectiveness of alcohol, cigarette, marijuana, and other drug prevention efforts. I present two tests to consider the adequacy of using these statistics when applied to drug use prevention programs. I used student survey data from grades 6 through 12 (N = 1,963,964) collected by the Georgia Department of Education between 2015 and 2017 and aggregated at the school level (N = 1036). I calculated effect sizes for an imaginary drug prevention program that (1) reduced 30-day alcohol, cigarette, and marijuana prevalence by 50%; and (2) maintained 30-day prevalence at a pretest level for multiple years. While both approaches to estimating intervention effects represent ideal outcomes for prevention that surpass what is normally observed, Cohen's statistics failed to reflect the effectiveness of these approaches. I recommend including an alternative method for calculating effect size for judging program outcomes. This alternative method, Relative Reduction in Prevalence (RRP), calculates ratio differences between treatment and control group drug use prevalence at posttest and follow-up, adjusting for differences observed at pretest. RRP allows researchers to state the degree to which an intervention could be viewed as efficacious or effective that can be readily understood by practitioners.

A Randomized Controlled Trial of a Theory-Informed School-Based Intervention to Prevent Waterpipe Tobacco Smoking: Changes in Knowledge, Attitude, and Behaviors in 6th and 7th Graders in Lebanon

Waterpipe tobacco smoking (WTS) is spreading worldwide. Research has indicated health consequences of WTS similar to cigarettes. Prevalence of WTS is high among young people. In Lebanon, current use rates of 35% have been documented among 13⁻15 year olds. We evaluated a school-based intervention. Method: We conducted a randomized-controlled-trial of a theory-informed WTS intervention. The intervention consisted of ten sessions based on social cognitive theory and the social influences approach. Thirty-one schools participated: 14 intervention and 17 control; a total of 1279 students completed pre and post assessments. We measured knowledge, attitudes and self-reported behaviors related to WTS using Chi-square tests and regression analyses to compare results between the two study arms. Results: The intervention increased knowledge of intervention group compared to control group participants-about WTS constituents and health consequences; and shifted attitudes of intervention group participants to be even more unfavorable towards WTS. We found no impact of the intervention on WTS behaviors. Discussion: The effectiveness of the intervention on knowledge and attitudes supports previous research. The lack of intervention effect on behavior is not surprising given the timing of the post assessment immediately after the intervention, and the social context that was supportive of waterpipe use.

Opinions of dental students toward tobacco cessation intervention in the United Arab Emirates

OBJECTIVE

The objective of this study was to investigate the opinions of dental students, in one of the dental colleges in the United Arab Emirates (UAE), toward providing tobacco cessation interventions to their patients.

MATERIALS AND METHODS

Three-hundred-and-fifty students were administered a questionnaire including questions about tobacco cessation interventions (with a response rate of 77%). We generated descriptive statistics for all questions and examined the frequency distribution and percentages of all answers. Data were analysed using cross-tabulations and χ(2) -tests. The statistical significance was set at P < 0.05.

RESULTS

While 83.4% of students agreed that dentists should be trained in tobacco cessation, 56% of students disagreed that they are adequately trained to assist the patient in stopping tobacco use. As the year of study increased, the students' 'agree' responses increased to the statements that the dentist should be trained and that the dentist has a role in assisting patients to stop smoking. Non-Arab students were more confident than Emiratis in tobacco cessation counselling. The percentage of female students who felt greatly confident in assisting was double that of male students. There was a significant difference between tobacco-user students and non-users in response to the question about dentist's role in assisting tobacco cessation.

CONCLUSION

A comprehensive tobacco cessation education and training program should be included in dental schools' curriculum in the UAE to further improve student confidence in providing tobacco cessation services to their patients.

Early smoking onset and risk for subsequent nicotine dependence: a monozygotic co-twin control study

OBJECTIVE

Early onset of regular smoking is associated with an elevated risk for later nicotine dependence. Whether or not this association is causal is unknown and has substantial public policy implications.

METHOD

The authors used a monozygotic co-twin control study design. Pairs were selected from the Virginia Adult Twin Study of Psychiatric and Substance Use Disorders for discordance in age at onset of regular smoking. Nicotine dependence was measured by the Fagerström test for nicotine dependence and level of craving.

RESULTS

The authors identified 175 male-male and 69 female-female monozygotic twin pairs who differed by at least 2 years in age at onset of regular smoking. During their period of heaviest smoking, the twin who began smoking earlier had significantly higher Fagerström test scores in both the male-male (Cohen's d=0.20) and female-female twin pairs (d=0.26). Craving for cigarettes when unable to smoke was also higher in the early-onset member in both groups (male pairs, d=0.38; female pairs, d=0.25). The early-onset smoking twin did not differ from the later-onset twin in symptoms of alcohol or cannabis abuse or dependence, current alcohol use, or maximal level of cannabis, sedative, stimulant, or cocaine use.

CONCLUSIONS

Controlling for genetic and familial-environmental effects, age at onset of regular smoking predicted level of nicotine dependence. Consistent with the animal literature, these findings suggest that in humans, early nicotine exposure directly increases level of later nicotine dependence. These results should be interpreted in the context of the methodological strengths and limitations of the monozygotic co-twin design.

Motivations for genetic testing for lung cancer risk among young smokers

OBJECTIVE

To examine why young people might want to undergo genetic susceptibility testing for lung cancer despite knowing that tested gene variants are associated with small increases in disease risk.

METHODS

The authors used a mixed-method approach to evaluate motives for and against genetic testing and the association between these motivations and testing intentions in 128 college students who smoke.

RESULTS

Exploratory factor analysis yielded four reliable factors: Test Scepticism, Test Optimism, Knowledge Enhancement and Smoking Optimism. Test Optimism and Knowledge Enhancement correlated positively with intentions to test in bivariate and multivariate analyses (ps<0.001). Test Scepticism correlated negatively with testing intentions in multivariate analyses (p<0.05). Open-ended questions assessing testing motivations generally replicated themes of the quantitative survey.

CONCLUSION

In addition to learning about health risks, young people may be motivated to seek genetic testing for reasons, such as gaining knowledge about new genetic technologies more broadly.

Critical discussion of social-cognitive factors in smoking initiation among adolescents

Social-cognitive models have often been used in research on prevention in adolescent populations, even though the models were designed to describe adult behavior. The aim of the study reported here was to examine critically and constructively the five social-cognitive factors in the 'attitude, social influence, self-efficacy' (ASE) model. Methods. The examination draws on the results of a qualitative follow-up study of smoking initiation based on semi-structured interviews and observations of 12 adolescents in two Danish school classes, grades 7 and 8. The qualitative study was conducted in connection with and sampled from a large quantitative study and the results of both studies are discussed. In the analyses, we explored the ASE constructs according to how they are described in the ASE theory. Furthermore, we examined contradictions and aspects which are not explained in the model and if relevant discussed these aspects using other theoretical frameworks. Results. The results showed that aspects other than those in the ASE model are also important. Smoking initiation was often situational and unplanned and was sometimes used in negotiating social relationships and identity. Furthermore, the social-cognitive models are based on the assumption that adolescents talk about smoking norms and have a high degree of individual reflexivity, which is not always characteristic of adolescent behavior. Conclusion. Applying theoretical models in health research should be a continuous process of both applying the model and discussing the theoretical assumptions of the model when applied to a specific sample. The results of the qualitative study provide some support for use of the ASE model, but the results also suggest that further studies are needed to explore how social-cognitive models can be expanded to be more comprehensive behavioral models.

The promise of long-term effectiveness of school-based smoking prevention programs: a critical review of reviews

I provide a review and critique of meta-analyses and systematic reviews of school-based smoking prevention programs that focus on long-term effects. Several of these reviews conclude that the effects of school-based smoking prevention programs are small and find no evidence that they have significant long-term effects. I find that these reviews all have methodological problems limiting their conclusions. These include severe limiting of the studies included because of performance bias, student attrition, non-reporting of ICCs, inappropriate classification of intervention approach, and inclusion of programs that had no short-term effects. The more-inclusive meta-analyses suggest that school-based smoking prevention programs can have significant and practical effects in both the short- and the long-term. Findings suggest that school-based smoking prevention programs can have significant long-term effects if they: 1) are interactive social influences or social skills programs; that 2) involve 15 or more sessions, including some up to at least ninth grade; that 3) produce substantial short-term effects. The effects do decay over time if the interventions are stopped or withdrawn, but this is true of any kind of intervention.

School-based smoking prevention programs with the promise of long-term effects

I provide a systematic review of trials of school-based smoking prevention programs that had at least 15 sessions, preferably with some in high school, that reported significant short-term effects, and that included long-term follow-up. This is supplemented with a description of some other programs that produce short-term effects that portend large long-term effects. I conclude that school-based programs can have long-term effects of practical importance it they: include 15 or more sessions over multiple years, including some in high school; use the social influence model and interactive delivery methods; include components on norms, commitment not to use, intentions not to use, and training and practice in the use of refusal and other life skills; and use peer leaders in some role. School-based programs of this type can reduce smoking onset by 25-30%, and school plus community programs can reduce smoking onset by 35-40% by the end of high school. Some early childhood programs that do not have smoking prevention as their main aim, including home nursing, the Good Behavior Game, the Positive Action program and others, seem to change the developmental trajectories of children so that they are less likely to engage in multiple problem behaviors, including smoking, as adolescents. This review makes it clear that effective school-based smoking prevention programs exist and can be adopted, adapted and deployed with success - and should be.

Mechanisms of adolescent smoking cessation: roles of readiness to quit, nicotine dependence, and smoking of parents and peers

Multiple levels of influence should be considered in interventions aimed at the adolescent smoker, including psychological, addiction, peer and parental influences. However, the mechanism by which these variables influence the process of smoking cessation in adolescents is not well elucidated. Therefore, this prospective study tested two models among 850 adolescent smokers, specifying the direct and indirect relations between adolescents' readiness to quit smoking, levels of nicotine dependence, and smoking behavior of their parents and friends. One year later smoking cessation was assessed. Results showed that, among adolescent smokers, readiness to quit was positively associated with quit attempts, while nicotine dependence was inversely associated with successful cessation. Instead of a direct relation, parental and peers' smoking were inversely related to smoking cessation through nicotine dependence. The findings emphasize that interventions should be developed and tested within and outside the school setting, as well as within the family situation. In addition, the strong impact of nicotine dependence on successful cessation indicates that a more direct approach is needed to lower nicotine dependence among adolescents.

Adolescent medical providers' willingness to recommend genetic susceptibility testing for nicotine addiction and lung cancer risk to adolescents

OBJECTIVE

To examine the influences of disease, lifestyle, and other factors on adolescent medical providers' willingness to recommend genetic susceptibility testing (GST).

METHOD

Providers attending a national conference completed a self-report survey (n = 232) about their willingness to recommend hypothetical GSTs, differentiated by disease (nicotine addiction/lung cancer), patient lifestyle (nonsmoker/smoker), and other contextual factors.

RESULTS

Compared to recommending GST unconditionally, providers were more willing to recommend GST with parental/patient consent/assent, and in the presence of a preexisting illness and substance abuse history. Compared to offering nicotine addiction GST to a nonsmoker, providers were more willing to offer this type of testing to a smoker and were more willing to offer GST for lung cancer regardless of patient lifestyle.

CONCLUSIONS

Providers' willingness to recommend GSTs is sensitive to many factors. Efforts to integrate GST into adolescent preventive care likely will need to address these and other influences on provider behavior.

Interest in genetic counseling and testing for adolescent nicotine addiction susceptibility among a sample of adolescent medicine providers attending a scientific conference on adolescent health

PURPOSE

Preventing adolescents from smoking and becoming addicted to nicotine is an important public health issue. New research on the genetics of susceptibility to nicotine addition is emerging and may eventually help to identify adolescents at high risk. Over time, genetic counseling and testing for nicotine addiction susceptibility may become incorporated into tobacco control practice, and providers in primary care settings are likely to be at the forefront of these services. As such, it is important to understand the attitudes and practices of adolescent medicine providers toward tobacco control and genetic testing to anticipate better the needs and interests of these individuals and prepare for the future. This study describes adolescent medicine providers' interest, and correlates of their interest, in genetic counseling and testing for nicotine addiction susceptibility among their adolescent patients--a test that is not yet clinically available.

METHODS

Adolescent medicine providers attending a national scientific conference (N = 232) completed a survey about their patient tobacco control and other screening behaviors, perceptions of their patients' attitudes and beliefs toward tobacco control, and their own attitudes and beliefs about smoking and genetics.

RESULTS

Providers who engaged in more regular tobacco screening behaviors with their adolescent patients (odds ratio [OR] = 4.07, 95% confidence interval [CI] = 2.20, 7.751, p = .00) and those who were more optimistic that biobehavioral research would lead to significant improvements in adolescent smoking prevention and treatment (OR = 2.47, 95% CI = 1.40, 4.37, p = .00), were more interested in counseling and testing.

CONCLUSIONS

In the future, adolescent wellness visits may present an opportunity to offer genetic counseling and testing for nicotine addiction susceptibility. Implementation at the provider level may depend on tobacco screening behavior and research optimism. Educating providers about safe and effective adolescent tobacco control strategies incorporating genetics will be essential.

Adolescents and tobacco use: systematic review of qualitative research methodologies and partial synthesis of findings

After a brief overview of adolescent tobacco control, methodological features and content areas of 78 qualitative studies of adolescent smoking published in English prior to September 2002 were assessed. Narrative syntheses of three content areas - peer influences, access/sales issues, and dependence/addiction - were also undertaken. Many studies failed to provide sufficient sampling and subject characterization details and more effort was required to demonstrate data validity and reliability. Syntheses of the content areas revealed important common themes. Relationships to quantitative research were informative and suggested other research questions. The review highlights the heuristic value of qualitative research on adolescent smoking. Funding was provided by The Cancer Council New South Wales and NSW Health/Hunter Medical Research Institute.

[Tobacco dependency and adolescents: a good time to give up smoking? Relation to social and family factors]

OBJECTIVES

To find the prevalence and dependency of adolescents on tobacco, its relation with family and social factors and the motivation for giving up smoking.

DESIGN

Cross-sectional, descriptive study using questionnaires.

SETTING

Secondary school, Jaén, Spain.

PARTICIPANTS AND MEASUREMENTS

A total of 232 students: the questionnaire included questions on age, sex, tobacco consumption, smoking habits of family and friends, and family structure. The following tests were given: the Apgar family (AFT), Fagerström (FT), and Richmond (RT) tests.

RESULTS

Mean age 14.1 years old (95% CI, 13.9-14.3; range, 5 years); 57% boys. A 22% (17.1%-24.5%) were smokers, most of whom were boys (65.2%-86.7%; P<.001, *2) and were older than non-smokers (0.7-1.5; P<.001, Student's t). Mean consumption was 9.2 cigarettes a day (7.4-11.0) over 32 months (14.6-49.5). Friends who smoked were more frequent among adolescents who smoked (80.9%-99%) than among non-smokers (57.3%-70.6%; P<.001, *2). Smoking every day increased consumption by 6 cigarettes a day (3.6-9.2; P<.001, Student's t). In 71% (65.3%-76.6%) of families, there were smokers, principally the parents (63.3%-74.6%), who, in 85% (74.2%-95.8%) of cases, disapproved of their son/daughter smoking. Family dysfunction was more frequent in smokers (30% mild [16.1%-43.9%] and 17% severe [5.4%-28.6%]; P<.001, *2). The FT was positive for 12% (2%-22%) and was associated with the consumption of cigarettes per day (r=0.78; P<.05, Pearson). The RT was positive for 22% (15.1%-28.9%): 70% in the contemplation stage (55.6%-84.3%); 17% in preparation (5.4%-28.6%); 13% in action (3%-23%).

CONCLUSIONS

The consumption of tobacco among adolescents is related to family function and having friends who smoke. The low dependency and the motivation to change make this stage of life a good moment to concentrate on anti-smoking counselling.

Opinions of South Carolina dental students toward tobacco use interventions

OBJECTIVES

Tobacco use accounts for 75 percent of oral cancer deaths in the United States. One objective of Healthy People 2010 is to increase the percentage of dentists who provide smoking cessation counseling. However, studies of dentists have shown that the majority feel inadequately prepared to do so. The objective of this study was to determine the opinions of dental students at the Medical University of South Carolina (MUSC) regarding the provision of tobacco use interventions for patients.

METHODS

In 2002, 163 students were administered a written questionnaire which included questions about tobacco use interventions (response rate=80 percent). Opinion items were analyzed using factor analysis, Fisher's Exact Test, and ANOVA (a < or = 0.025).

RESULTS

While 89 percent of students agreed that dentists should be trained to provide tobacco cessation education, only 39 percent thought that they themselves were adequately trained. Students' opinions toward the role and training of dentists in providing tobacco use interventions differed by academic year. Only 14.1 percent of dental students were quite or very confident in their ability to help patients to stop smoking.

CONCLUSIONS

This study indicates that although MUSC dental students support tobacco cessation training for dentists, the majority responded that they are not adequately trained and are not comfortable providing tobacco cessation education to patients. A comprehensive tobacco prevention and cessation program is indicated for the objective of Healthy People 2010 to be met.

Lung cancer mortality patterns in selected Central, Eastern and Southern European countries

Significant changes in the prevalence of tobacco smoking have been observed in many European countries. EU candidate countries have also experienced major changes with respect to tobacco smoking, which have resulted in changes in the frequency of lung cancer. In men in the majority of these countries, a reduction of mortality rates has been observed recently, while in Hungary and Poland a deceleration of mortality increase was observed in the 1990s. The situation is much less favorable in females, where in the majority of countries a continuous increase of mortality rates has been observed, the only exceptions being Latvia, Lithuania and, to a lesser extent, Estonia. In Hungarian women, an acceleration of the increase rate was observed in the 1980s and 1990s (compared with the 1970s). Patterns of lung cancer mortality in analyzed countries are somewhat similar to those observed in EU member states. Recent analyses of time trends of lung cancer in EU countries showed, in general, a decreasing risk in the majority of male populations and an increase in several countries in women. If the decrease of mortality is to be achieved and maintained in the longer term, efforts have to be focused on young generations (entering adulthood now or in the near future). Despite all the difficulties present in reducing tobacco smoking in youth, it seems that one of the most important ways to reduce the future lung cancer burden in current and new EU member states is to strengthen efforts toward changing smoking attitudes in young generations.