Loading...
Investigators previously showed that exposure to medical marijuana ads is linked to increased past-month marijuana use among adolescents (NEJM JW Pediatr Adolesc Medicine Sep 2015 and Psychol Addict Behav 2015; 29:613). Now they report follow-up data extending an additional 5 years. Sixth- and seventh-graders (ages 11–12 in 2008) from 16 California middle schools were surveyed nine times until 2017 (age 19). Questions included past-week exposure to medical marijuana ads (“not at all” to “every day”), past-month marijuana use, intentions to use, positive expectancies (e.g., “marijuana helps me relax”) and negative consequences (e.g., “got in trouble at school or home”).
Almost 5000 students completed wave 4 surveys (year 2010) and 2500 comple…