Teens who use marijuana or smoke cigarettes are at increased risk of having a psychotic experience by age 18, according to a new study.
Late adolescent onset cannabis use was associated with a roughly threefold (300%) increased risk for a psychotic episode after adjusting for potential confounders, and early-onset use was even more strongly associated with increased risk, the analysis found.
The adjusted risk associated with cigarette smoking was much less robust.
The study, published online in JAMA Psychiatry, suggests that marijuana use by teens, and cigarette smoking to a lesser extent, may be independent risk factors for psychotic episodes later in adolescence.
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Source Reference: Jones HJ, et al. “Association of combined patterns of tobacco and cannabis use in adolescence with psychotic experiences” JAMA Psych 2018; DOI: 10.1001/jamapsychiatry.2017.4271.
Full research paper here: