Among adolescent tobacco and cannabis users, alcohol use and secondhand smoke/vape exposure were the strongest predictors of same-day poly-product use.
Adolescent health researchers, school-based prevention specialists, and substance use counselors.
Alcohol use increased odds of same-day poly-product use by 1.88 to 8.31 times among teen users
What the researchers found
Among 536 10th and 11th graders who used tobacco/cannabis, 8.6% reported frequent same-day poly-tobacco use, 13.8% frequent poly-cannabis use, 13.3% frequent poly-drug use, and 3.4% vape mixing. Past 30-day alcohol use was associated with 1.88-8.31x higher odds of same-day poly-use. Secondhand smoke/vapor exposure consistently predicted higher odds (1.13-1.26x) across all patterns.
Why it matters
Same-day poly-product use carries higher health risks than single-product use. Identifying that alcohol and environmental smoke exposure are key drivers suggests specific intervention targets.
The numbers in context
536 students (66.2% Hispanic, 62.5% male). Frequent same-day poly-tobacco: 8.6%. Poly-cannabis: 13.8%. Poly-drug: 13.3%. Vape mixing: 3.4%. Alcohol use OR range: 1.88-8.31 (p<0.05). Secondhand exposure OR range: 1.13-1.26 (p<0.05).
How the study worked
Cross-sectional survey of 536 10th/11th grade students (predominantly Hispanic, 62.5% male) who reported tobacco or cannabis use. Regression models examined intrapersonal, psychological, societal, and environmental correlates of same-day poly-product use frequency.
What this study cannot tell us
Cross-sectional design. Predominantly Hispanic sample from Southern California may not generalize. Self-reported substance use. Only current users were included, creating a selected sample. Cannot determine whether alcohol causes poly-use or if both reflect a common underlying factor.
How to read the evidence
Reasonable sample size with detailed poly-use measurement, but cross-sectional design and regional sample limit causal and generalizable conclusions.
When this study was published
2025 publication.
The bigger picture
The role of environmental exposure (secondhand smoke/vapor) in predicting poly-use highlights that adolescent substance use is not purely an individual choice but is shaped by the environments they inhabit.
Questions still open
- Would reducing adolescent alcohol use decrease poly-product tobacco/cannabis use?
- Do smoke-free environments reduce poly-use rates among adolescent users?
Read the original research
Multilevel Correlates of Same Day Poly-Product Use/Co-Use among Adolescents Who Use Tobacco and Cannabis.
Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco, 28(1), 26-35
Citation
Jacobs, Wura; Qin, Weisiyu A; Jafarzadeh, Nikki S; Barrington-Trimis, Jessica; Leventhal, Adam M. (2025). Multilevel Correlates of Same Day Poly-Product Use/Co-Use among Adolescents Who Use Tobacco and Cannabis.. Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco, 28(1), 26-35. https://doi.org/10.1093/ntr/ntaf150
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