claim: "the average age of first marijuana use is 12."
author: protect families first
evidence_1: sep 2, 2016 ... in 2014, the mean age at first use estimate among persons aged ≥12 years was  <19 years; among persons aged 12–17 years, the estimated ...
evidence_2: nov 13, 2018 ... marijuana use among teens is thought to be more widespread than ... about 2  percent report that they first used marijuana before age 12.
evidence_3: jun 25, 2015 ... the increase mostly reflects a recent rise in use of marijuana, the most commonly  used illicit ... most people use drugs for the first time when they are teenagers. ...  drinking by underage persons (ages 12 to 20) has declined.
evidence_4: sep 7, 2017 ... section 12: sample size and population tables – 12.1 to 12.9 .... estimates for  mean age of first use (afu) and average number of days used are the exception.  .... the selected illicit drugs include marijuana, cocaine.
evidence_5: national survey on drug use and health: trends in prevalence of marijuana/  hashish for ages 12 or older, ages 12 to 17, ages 18 to 25, and ages 26 or  older; ...