Bidirectional associations between e-cigarette use and alcohol use across adolescence

Area of Science:

• Adolescent health
• Substance use research
• Public health policy

Background:

• Prospective evidence on bidirectional associations between adolescent e-cigarette and alcohol use is limited.
• Understanding these relationships is crucial for developing effective prevention strategies and informing public health policies.
• Youth substance use patterns, including co-use of e-cigarettes and alcohol, require ongoing investigation.

Purpose of the Study:

• To examine the prospective, bidirectional associations between e-cigarette use and alcohol use initiation among adolescents.
• To determine if baseline e-cigarette use predicts subsequent alcohol initiation and vice versa.
• To explore potential gender differences in these associations.

Main Methods:

• A prospective cohort study involving 3,396 high school students in Los Angeles, surveyed every six months over four years (2013-2017).
• Analyses focused on participants who were never users of alcohol or e-cigarettes at baseline.
• Generalized linear mixed models were employed to estimate adjusted odds ratios for initiation of alcohol and e-cigarette use.

Main Results:

• Among adolescent alcohol never-users, e-cigarette users had 3.54 times the odds of initiating alcohol use compared to non-users.
• Among adolescent e-cigarette never-users, alcohol users had 3.23 times the odds of initiating e-cigarette use compared to non-users.
• The association between e-cigarette use and subsequent alcohol initiation was stronger in males than females.

Conclusions:

• E-cigarette and alcohol use can serve as important markers for identifying adolescents at risk for future use of the other substance.
• The findings suggest a bidirectional relationship, where use of one substance increases the likelihood of initiating the other.
• Further research into the underlying mechanisms is necessary to establish causality and inform targeted interventions.