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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.
Mason Tvert, communications director with the Marijuana Policy Project, said the study doesn't show using marijuana causes any of these problems; it just underscores a link between individuals who use marijuana and those who experience these types of problems.
"The article expressly states that there remains no evidence that using marijuana causes depression, suicide or dropping out of school," he said. "It simply shows that teens who are prone to developing these problems are more likely to have used marijuana."
NIDA Director Dr. Nora Volkow says she was not surprised by the study's conclusions.
"This analysis is consistent with findings that show heavy marijuana users generally report lower life satisfaction, poorer mental and physical health, more relationship problems, and less academic and career success compared to non-marijuana-using peers," Volkow said. "The risk of addiction is also higher when use initiates as a teen. It is important that we continue to discourage young people from using marijuana."
"The results provide very strong evidence for a more direct relationship between adolescence cannabis use and later harm," said lead author Edmund Silins with the National Drug and Alcohol Research Centre at the University of New South Wales, Australia. "The findings are particularly timely given the growing movement to decriminalize or legalize cannabis because this has raised the possibility the drug might become more accessible to young people."
Researchers also found that while a causal link to depression and welfare dependence was unlikely, heavy marijuana use increased the odds. Evidence was not sufficient, according to the study authors, to support a causal link between marijuana use and suicide.
Findings
We recorded clear and consistent associations and dose-response relations between the frequency of adolescent cannabis use and all adverse young adult outcomes. After covariate adjustment, compared with individuals who had never used cannabis, those who were daily users before age 17 years had clear reductions in the odds of high-school completion (adjusted odds ratio 0·37, 95% CI 0·20—0·66) and degree attainment (0·38, 0·22—0·66), and substantially increased odds of later cannabis dependence (17·95, 9·44—34·12), use of other illicit drugs (7·80, 4·46—13·63), and suicide attempt (6·83, 2·04—22·90).
Interpretation
Adverse sequelae of adolescent cannabis use are wide ranging and extend into young adulthood. Prevention or delay of cannabis use in adolescence is likely to have broad health and social benefits. Efforts to reform cannabis legislation should be carefully assessed to ensure they reduce adolescent cannabis use and prevent potentially adverse developmental effects.
"The findings are particularly timely given the growing movement to decriminalize or legalize cannabis because this has raised the possibility the drug might become more accessible to young people."
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.
originally posted by: pl3bscheese
You have an error in the OP. You said there isn't any evidence for correlation. This is false. The statistics show correlation. They don't prove causation. That's different. Might want to change that.
originally posted by: Bobaganoosh
The depression, suacide, lack of higher education angle that they seem to be pushing doesn't really mention the excessive fines, stigma, and ruin that comes with being caught with any amount of the plant during adolescence. The plant doesn't cause these things, the prohibition and punishment is at the root of all associated whoes here.
These studies get more laughable every time.
Boba
This analysis is consistent with findings that show heavy marijuana users generally report lower life satisfaction, poorer mental and physical health, more relationship problems, and less academic and career success compared to non-marijuana-using peers,