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Trajectories of Nicotine and Cannabis Vaping and Polyuse From Adolescence to Young Adulthood.


ABSTRACT: Importance:Little is known about cannabis vaping trajectories across adolescence and young adulthood or the co-occurrence with nicotine vaping. Objective:To evaluate nicotine vaping and cannabis vaping trajectories from late adolescence to young adulthood (?18 years of age) and the extent of polysubstance vaping. Design, Setting, and Participants:In this prospective cohort study, 5 surveys (including information on substance vaped) were completed at 10 high schools in the Los Angeles, California, metro area. Students were surveyed at 6-month intervals from fall of 11th grade (October to December 2015; wave 5) through spring of 12th grade (March to June 2017; wave 8) and again approximately 1 to 2 years after high school (October 2018 to October 2019; wave 9). Exposures:Past 30-day nicotine and cannabis vaping frequency across 5 waves. Main Outcomes and Measures:Self-reported frequency of nicotine vaping and cannabis vaping within the past 30 days across 5 time points from late adolescence to young adulthood. Trajectories were measured with these past 30-day use frequencies at each wave. Parallel growth mixture modeling estimated conditional probabilities of polysubstance vaping. Results:The analytic sample included 3322 participants with at least 1 time point of data (mean [SD] age, 16.50 [0.42] years at baseline; 1777 [53.5%] female; 1573 [47.4%] Hispanic or Latino). Growth mixture modeling identified the 5-trajectory model as optimal for both nicotine vaping and cannabis vaping. Trajectories for nicotine and cannabis vaping were similar (nonusers: 2246 [67.6%] nicotine, 2157 [64.9%] cannabis; infrequent users: 566 [17.0%] nicotine, 608 [18.3%] cannabis; moderate users: 167 [5.0%] nicotine, 233 [7.0%] cannabis; young adult-onset frequent users: 213 [6.4%] nicotine, 190 [5.7%] cannabis; adolescent-onset escalating frequent users: 131 [3.9%] nicotine, 134 [4.0%] cannabis). Males had greater odds of belonging to the adolescent-onset escalating frequent users nicotine (adjusted odds ratio, 2.88; 95% CI, 1.58-5.23; P?

SUBMITTER: Lanza HI 

PROVIDER: S-EPMC7539114 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Trajectories of Nicotine and Cannabis Vaping and Polyuse From Adolescence to Young Adulthood.

Lanza H Isabella HI   Barrington-Trimis Jessica L JL   McConnell Rob R   Cho Junhan J   Braymiller Jessica L JL   Krueger Evan A EA   Leventhal Adam M AM  

JAMA network open 20201001 10


<h4>Importance</h4>Little is known about cannabis vaping trajectories across adolescence and young adulthood or the co-occurrence with nicotine vaping.<h4>Objective</h4>To evaluate nicotine vaping and cannabis vaping trajectories from late adolescence to young adulthood (≥18 years of age) and the extent of polysubstance vaping.<h4>Design, setting, and participants</h4>In this prospective cohort study, 5 surveys (including information on substance vaped) were completed at 10 high schools in the L  ...[more]

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