What causes one person to become addicted to marijuana while another does not depends on many factors—including their family history (genetics), the age they start using, if they also use other drugs, their family and friend relationships, and if they take part in positive activities like school, after school clubs or or sports. More research needs to be done to determine if people who use marijuana for medical reasons are at the same risk for addiction as those who use it just to get high.
Watch the Swiss Cheese Model of Drug Addiction and learn why some people who use drugs become addicted and others do not.
National Institute on Drug Abuse. “The Swiss Cheese Model of Drug Addiction” http://www.youtube.com. 12 September 2014. Web. 30 April 2019