Frequent teen marijuana use linked to issues later in life

Updated 9:18 AM EDT, Wed September 10, 2014

Story highlights

Study: Teens who use marijuana daily are less likely to get high school diploma

Daily teen users 18 times more likely to become dependent on pot, study says

Study: Adolescents who frequently use marijuana also more likely to use other drugs

Study fails to show that marijuana use causes these problems, advocate says

CNN —  

Teens who use marijuana daily before age 17 are more than 60% less likely to get their high school diploma than those who’ve never used pot, according to a new study published Tuesday in the journal The Lancet Psychiatry.

The study, done by researchers in Australia and New Zealand, is a meta-analysis of three previous long-running studies that included nearly 4,000 participants.

Researchers looked at links between frequent cannabis use and seven developmental outcomes up until the age of 30. They looked specifically at whether the teens completed high school, got a college degree, were dependent on marijuana, had attempted suicide, were diagnosed with depression, used other illegal drugs and/or relied on welfare to support themselves.

The study found daily adolescent users were 18 times more likely to become dependent on marijuana, seven times more likely to attempt suicide, and eight times more likely to use other illegal drugs in the future.