Predictors of smoking development in a population-based sample of adolescents: a prospective study

[Changes in tobacco use and related factors in Junior High School students, Lara State, Venezuela, 2000-2003]

The Global Youth Tobacco Survey (GYTS) is a school-based surveillance system. In Lara State, Venezuela, it was conducted by a coalition of organizations. The instrument includes: attitudes, knowledge, behaviors, exposure to environmental tobacco smoke, mass media, and marketing. Participation was 85.7% in 2000 and 79.3% in 2003. Comparing prevalence (%) from 2000 to 2003: "first contact": unchanged (22.8%); "males having first cigarette before the age of 10": decreased (21.5% to 16.7%); "current cigarette smoker": unchanged (8.4% to 8.3%); "male smokers wanted to quit": increased (62.6% to 84.7%); "exposure to environmental tobacco smoke": increased (43.9% a 50.7%), "support ban on smoking in public places": unchanged (> 80%), "received free promotional cigarettes": increased (9.5% a 13.4%), and "no problem buying cigarettes": decreased in males (97% to 74.3%) and in females (95.9% to 90.3%). Tobacco use has remained unchanged, a situation attributed in part to marketing, including free cigarettes, and lack of law enforcement. GYTS provides evidence to support the design, implementation, and monitoring of policies and programs aimed at the prevention and control of tobacco use among adolescents.

Exploring the relationship between genetic and environmental influences on initiation and progression of substance use

AIMS

To examine the genetic and environmental contributions to the initiation of use and progression to more serious use of alcohol, cigarettes and marijuana during adolescence, and to examine the relationship between initiation and progression of substance use.

DESIGN

The study used a twin-based design and a new theoretical model, the causal-common-contingent (CCC) model. This allows modelling of the relationship between initiation of use and progression to heavier use as a two-stage model and the examination of genetic and environmental influences on both stages, while taking into account their relationship.

PARTICIPANTS

The participants consisted of 1214 twin pairs (69% response rate) aged 11-19 years sampled from the UK population-based Cardiff Study of All Wales and North-west of England Twins (CaStANET).

MEASUREMENTS

Data on adolescent initiation and progression to more serious use of alcohol, cigarettes and marijuana were obtained using self-report questionnaires.

FINDINGS

Initiation of alcohol and progression to heavier alcohol use had separate but related underlying aetiologies. For cigarette and marijuana use the relation between initiation and progression to heavier use was stronger, suggesting greater overlap in aetiologies. For all three substances, environmental influences that make twins more similar (common environment) tended to be greater for initiation, while genetic influences were stronger for heavier use.

CONCLUSIONS

These findings have implications for policy decisions aimed at an adolescent and early adult age group. Specifically, these findings suggest that it may be more efficacious to focus alcohol interventions on risk factors for the development of heavier use rather than initiation of use. In contrast, interventions aimed at reducing the initiation of cigarettes and marijuana use may be more appropriate.

Social influences and self-efficacy as predictors of youth smoking initiation and cessation: a 3-year longitudinal study of vocational high school students in Taiwan

AIMS

This 3-year longitudinal study examined changes in patterns of risk factors and protective factors of smoking initiation and cessation among vocational high school students in Taipei, Taiwan.

DESIGN AND SETTING

In 2000, a total of 2151 10th grade students from 16 vocational high schools were assessed and followed up in the 11th and 12th grades. Self-administered questionnaires were collected in each year to assess the pattern of changes in smoking behaviors, and risk and protective factors.

FINDINGS

Of the 1654 non-smokers in the 10th grade, 227 students initiated smoking by the 12th grade. Higher risk factors such as peer smoking, peers offering cigarettes, alcohol use and lower protective factors, such as refusal self-efficacy, antismoking attitude and belief in the 10th grade predicted youth initiation by grade 12. Increases in risk factors and decreases in protective factors during the years from 10th to 12th grades were associated significantly with youth smoking initiation. Of the 494 smokers in the 10th grade, 76 students quit smoking by the 12th grade. Lower risk factors and higher protective factors in 10th grade smokers predict youth smoking cessation by grade 12. Decreases in risk factors and increases in protective factors were associated significantly with youth smoking cessation.

CONCLUSIONS

The risk factors (i.e. social influences) and protective factors (i.e. self-efficacy) examined in this study predict both youth smoking initiation and youth smoking cessation.

Religiosity, Refusal Efficacy, and Substance Use Among African-American Adolescents and Young Adults

Research points toward multiple pathways (i.e., psychosocial domains) through which religiosity influences substance use behaviors. This study examined whether refusal efficacy mediated the relationship between religiosity and substance use in African-American adolescents and young adults. Four hundred thirty-five urban and rural African-Americans, aged between 12 and 25, completed measures of private and public religiosity, refusal efficacy, and substance use (i.e., tobacco, alcohol, marijuana, and other illicit drug use). Tests for mediation were computed with private and public religiosity as independent variables, drug refusal efficacy as mediator, and substance use as the criterion. Results show that drug refusal efficacy mediated the relationship between private religiosity and tobacco, marijuana, and other illicit drug use, but not for alcohol use. Refusal efficacy also mediated the relationship between public religiosity and alcohol use, but not for other licit and illicit substances. The findings provide support for the unique impact of public religiosity when considering its role in preventive intervention. Future research should consider examining other psychosocial domains which may mediate the effect of religiosity on substance use behaviors among African-American adolescents.

The dose-response relationship of adolescent religious activity and substance use: variation across demographic groups

This article addresses two inconsistent findings in the literature on adolescent religious activity (RA) and substance use: whether a dose-response relationship characterizes the association of these variables, and whether the association varies by grade, gender, ethnicity, family structure, school type, and type of substance. Multinomial logistic regression analyses of a large, diverse data set of high school students in metropolitan Columbus, Ohio ( n = 33,007), found marked differences in alcohol, marijuana, and cigarette use among youths who never, occasionally, or regularly participated in RA. Weekly RA was consistently associated with less substance use, yet occasional RA sometimes was associated with greater use. Four groups accounted for variations in the RA-substance use relationship: African American youths, younger White youths, 12th-grade White males, and 12th-grade White females. Researchers should avoid assuming the RA-substance use relationship is dose-response and consider the implications of this complexity for theory and practice.

Personal, interpersonal, and cultural predictors of stages of cigarette smoking among adolescents in Johannesburg, South Africa

OBJECTIVE

This study examined the personal, parental, peer, and cultural predictors of stage of smoking among South African urban adolescents.

DESIGN

A cross-sectional design was employed. A stratified random approach based on census data was used to obtain the sample. Analyses were conducted using logistic regression.

SETTING

The study took place in communities in and around Johannesburg, South Africa.

SUBJECTS

Participants consisted of 731 adolescents in the age range of 12-17 years old. The sample was 47% male and 53% female, and contained four ethnic classifications: white, black, Indian, and "coloured" (a South African term for mixed ancestry).

METHODS

A structured, in-person interview was administered to each participant in private by a trained interviewer, after obtaining consent.

MAIN OUTCOME MEASURES

The dependent variables consisted of three stages of smoking: non-smoking, experimental smoking, and regular smoking. The independent measures were drawn from four domains: personal attributes, parental, peer, and cultural influences.

RESULTS

Factors in all four domains significantly predicted three different stages of smoking. Personal attributes (internalising and externalising) distinguished among the three stages. Parental factors (for example, affection) reduced the odds of being a regular smoker compared with an experimental smoker or non-smoker, but did not differentiate experimental smokers from non-smokers. Findings from the peer domain (for example, peer substance use) predicted an increase in the risk of being a regular smoker compared with an experimental smoker or non-smoker. In the cultural domain, ethnic identification predicted a decrease in the risk of being a regular smoker compared with an experimental smoker, whereas discrimination and victimisation predicted an increase in the risk of being an experimental smoker compared with a non-smoker.

CONCLUSIONS

All the domains were important for all four ethnic groups. Four psychosocial domains are important in distinguishing among the three stages of smoking studied. Some predictors differentiated all stages of smoking, others between some of the stages of smoking. Therefore, intervention and prevention programmes which are culturally and linguistically sensitive and appropriate should consider the individual's stage of smoking.

Understanding the Association Between Authoritative Parenting and Adolescent Smoking

BACKGROUND

Research on adolescent cigarette smoking has attempted to measure the role of parents in preventing smoking experimentation and uptake. However, aspects of parental influence have often been limited to parental smoking behavior or antismoking socialization. Only a limited number of studies considered the hypothesis that the influence of parenting on adolescent current cigarette smoking may extend beyond parental behavior and antismoking socialization to consider broader measures of the parent-child relationship, such as parenting style.

METHODS

The sample was nationally representative and included 17,287 high school students nationwide. Data were used to categorize the parenting style--authoritative, permissive, autocratic, and unengaged--experienced by each respondent. Logistic regression analysis was used to assess the association between parenting style and adolescent current cigarette smoking.

RESULTS

Authoritative parenting was associated with a reduction in the odds of adolescent current cigarette smoking (OR: 0.74, 99% CI: 0.58, 0.95). When authoritative parenting is simultaneously considered with believing parents' opinions about smoking are important, authoritative parenting was no longer a significant correlate of adolescent current cigarette smoking, while believing parents' opinions about smoking are important was associated with a 45% (99% CI: 0.48, 0.64) reduction in the odds of adolescent current cigarette smoking. Authoritative parenting was associated with a more than three-fold increase (OR: 3.65, 99% CI: 2.87, 4.66) in the odds of believing parents' opinions about smoking are important.

DISCUSSION

Interventions may want to educate parents about authoritative parenting, which includes the importance of having appropriate and routine conversations with their children, requiring chores, and implementing general rules and boundaries.

Why do young women smoke? I. Direct and interactive effects of environment, psychological characteristics and nicotinic cholinergic receptor genes

Despite the health hazards, cigarette smoking is disproportionately frequent among young women. A significant contribution of genetic factors to smoking phenotypes is well established. Efforts to identify susceptibility genes do not generally take into account possible interaction with environment, life experience and psychological characteristics. We recruited 501 female Israeli students aged 20-30 years, obtained comprehensive background data and details of cigarette smoking and administered a battery of psychological instruments. Smoking initiators (n=242) were divided into subgroups with high (n=127) and low (n=115) levels of nicotine dependence based on their scores on the Fagerstrom Tolerance Questionnaire and genotyped with noninitiators (n=142) for single nucleotide polymorphisms (SNPs) in 11 nicotinic cholinergic receptor genes. We found nominally significant (P<0.05) allelic and genotypic association with smoking initiation of SNP rs2072660 and multilocus haplotypes (P<0.007-0.05) in CHRNB2 and nominal (P<0.05) allelic or genotypic association of SNPs in CHRNA7 (rs1909884), CHRNA9 (rs4861065) and CHRNB3 (rs9298629) with nicotine dependence. Employing logistic regression and controlling for known risk factors, the best-fitting model for smoking initiation encompassed a 5 SNP haplotype in CHRNB2, neuroticism and novelty seeking (P=5.9 x 10(-14), Nagelkerke r(2)=0.30). For severity of nicotine dependence, two SNPs in CHRNA7 (rs1909884 and rs883473), one SNP in CHRNA5 (rs680244) and the interaction of a SNP in CHRNA7 (rs2337980) with neuroticism, were included in the model (P=2.24 x 10(-7), Nagelkerke r(2)=0.40). These findings indicate that background factors, psychological characteristics and genetic variation in nicotinic cholinergic receptors contribute independently or interactively to smoking initiation and to severity of nicotine dependence in young women.

Public and private domains of religiosity and adolescent smoking transitions

We used data from a nationally representative sample of US adolescents in school grades 7 through 12 to explore the effects of public and private religiosity on initiation, escalation, and cessation of smoking. We found that adolescents' decisions to experiment with smoking are influenced by both their individual practice of their faith and by participation in a larger faith community. However, the effects of private and public religiosity are specific to different decision points on the smoking uptake process. Private religiosity was protective against initiation of regular smoking among nonsmokers. It also was protective against initiation of experimental smoking but only when the young person frequently attended religious services or a religious youth group. Although private religiosity appeared to discourage the uptake of smoking, it was unrelated to reduction or cessation once a young person has become addicted to cigarettes. In contrast, public religiosity did predict reduction and cessation of cigarette use among regular smokers. Taken together, these findings demonstrate that the domains in which religiosity are important extend beyond the individual and include religious institutions.

Epidemiology and etiology of adolescent smoking

PURPOSE OF REVIEW

Despite the socioeconomic and personal health costs directly attributed to smoking, over one-half of high school seniors have used cigarettes, and over 15% of seniors are daily smokers. This review summarizes the recent research concerning the psychosocial and physiologic risk and protective factors associated with adolescent smoking.

RECENT FINDINGS

Studies of the psychosocial risk factors have added to the evidence that stress, peers and family influences, ethnicity, and depression all serve as risk factors for the development and maintenance of smoking in adolescents. Protective factors include parental expectations and monitoring, religious activity, and sociopolitical factors, such as tobacco-related marketing bans and higher cigarette taxes. Adolescent smoking trajectories have been further defined and can be used to classify smokers in terms of dependence symptoms. Finally, neurobiological research has focused to a large extent on the concept of disinhibition as a risk factor for smoking in adolescents.

SUMMARY

While rates of smoking in adolescents have declined since 1997, millions of adolescents initiate or continue smoking each year, with deleterious health and psychosocial consequences. Research into the risk and protective factors for adolescent smoking, particularly that which ties psychosocial and neurobiological factors together, is necessary to inform the development of tailored and maximally efficacious treatments for this population.

Relationship between antisocial behaviour, attention-deficit hyperactivity disorder and maternal prenatal smoking

BACKGROUND

There is substantial evidence that maternal smoking during pregnancy is associated with both antisocial behaviour and symptoms of attention-deficit hyperactivity disorder (ADHD) in offspring. However, it is not clear whether maternal smoking during pregnancy is independently associated with antisocial behaviour or whether the association arises because antisocial behaviour and ADHD covary.

AIMS

To examine the relationship between maternal smoking during pregnancy, antisocial behaviour and ADHD in offspring.

METHOD

Questionnaires concerning behaviour and environmental factors were sent to twins from the CaStANET study and data analysed using a number of bivariate structural equation models.

RESULTS

Maternal prenatal smoking contributed small but significant amounts to the variance of ADHD and of antisocial behaviour. The best fitting bivariate model was one in which maternal prenatal smoking had a specific influence on each phenotype, independent of the effect on the other phenotype.

CONCLUSIONS

Both antisocial behaviour and ADHD symptoms in offspring are independently influenced by maternal prenatal smoking during pregnancy.

Smoking and young people's mental health

PURPOSE OF REVIEW

This review addresses the evidence on smoking and young people's mental health, reported during 2004.

RECENT FINDINGS

Research studies have confirmed the previously reported epidemiological associations of smoking with gender, race and social class, as well as suspected risk factors and antecedents. Among youths, the prevalence of smoking varies across subgroups of the population, classified by race/ethnicity and social class. Gender differences in smoking vary cross-nationally. Smoking among youths is higher when parents, siblings, or peers smoke. Smoking is also higher in youths with histories of early conduct problems, drinking and illegal drug use, depression, and suicidal behaviors. The protective role of youth involvement in sports and the lesser opportunity to smoke among youths involved in religious practice were also confirmed. Among young people, early conduct problems and associated early onset of daily smoking predict a greater likelihood of becoming nicotine dependent. The interpretation of the high smoking rate among schizophrenic patients as self-medication has been challenged by a recent study that reported that smoking predicted subsequent first hospitalization for schizophrenia. New findings suggest that young persons who experienced their first exposure to nicotine as relaxing are at elevated risk for becoming nicotine dependent.

SUMMARY

Longitudinal cohort studies and cross-sectional studies have been published on smoking and young people's mental health. These studies describe smoking correlates and identify predictors of negative outcomes of smoking, as well as predictors of nicotine dependence, smoking initiation, and smoking cessation.

Combining research approaches to advance our understanding of drug addiction

Drug addiction is a complex behavior, likely to be influenced by various genes, environmental factors, and gene-gene and gene-environment interactions. Various aspects of addiction are studied by different disciplines. Animal studies are increasing insight into brain regions and genes associated with addiction. Epidemiologic studies are establishing the factors increasing risk for initiation and continuation of substance use. Twin and adoption studies are increasing our understanding of the complex mechanisms involved in substance use, including comorbidity and gene environment interaction. Finally, molecular genetic studies in humans are starting to yield some converging findings. It is argued and illustrated with examples that greater awareness of progress in other disciplines can speed up our understanding of the complex processes involved in addiction. This should help our ability to identify who is at increased risk of becoming addicted and the development of prevention and intervention strategies targeted at an individual's specific needs.

Brief report: social risk factors predict cigarette smoking progression among adolescents with asthma

OBJECTIVE

To compare smoking progression in adolescents with and without asthma and to compare their psychosocial risk factors.

METHODS

Participants were 1,507 adolescents with asthma and 1,507 healthy matched controls from Waves I and II of the Add Health Project assessed at baseline and again 1 to 2 years later at follow-up. Three levels of smoking progression (defined as smoking more frequently and/or intensely over time) were identified: (a) Late Experimenters (never smokers at baseline, ever smokers at follow-up), (b) Early Experimenters (ever smokers at baseline, current/current frequent smokers at follow-up), and (c) Early Smokers (current smokers at baseline, current frequent smokers at follow-up).

RESULTS

Twenty percent of adolescents experienced progression in their smoking behavior; those with and without asthma were equally likely to progress. Among adolescents who progressed, 37% were Late Experimenters, 42% were Early Experimenters, and 21% were Early Smokers. Exposure to friends who smoked was a consistent and powerful social risk factor for smoking progression among adolescents with asthma-more so than among adolescents without asthma. This effect was intensified among Late Experimenters by the presence of a positive history of parent smoking.

CONCLUSIONS

Findings underscore the importance of addressing cigarette smoking behavior and its social risk factors among adolescents with asthma in both clinical and public health contexts, during early adolescence, and through research on this topic.