“Despite some contentious discussions regarding the addictiveness of marijuana, the evidence clearly indicates that long-term marijuana use can lead to addiction. Indeed, approximately 9% of those who experiment with marijuana will become addicted3 (according to the criteria for dependence in the Diagnostic and Statistical Manual of Mental Disorders, 4th edition [DSM-IV]). The number goes up to about 1 in 6 among those who start using marijuana as teenagers and to 25 to 50% among those who smoke marijuana daily.”

Adverse Health Effects of Marijuana Use (dfaf.org)

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“This study followed 6354 kids from age 15-16 until age 30. The authors concluded that the risk of developing psychosis was increased in individuals who tried cannabis 5 times or more. This increased risk was considered significant and adjusted for other risks such as parental psychosis, substance use, and more.”

Adolescent cannabis use, baseline prodromal symptoms and the risk of psychosis - PubMed (nih.gov)

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“This study of 14,798 adolescents age 12 -17 showed that respiratory symptoms such as wheezing was 2 times higher among those who used cannabis in vaping devises (ENDS – electronic nicotine delivery systems), more than those who used either e-cigarettes or regular cigarettes.”

Cannabis, Vaping, and Respiratory Symptoms in a Probability Sample of U.S. Youth - PubMed (nih.gov)