Individuals who are daily users of cannabis before age 17
are over 60% less likely to complete high school or obtain a degree compared to
those who have never used the drug, new research published in The Lancet
Psychiatry journal shows. The large meta-analysis also indicates that daily
users of cannabis during adolescence are seven times more likely to attempt
suicide, have an 18 times greater chance of cannabis dependence, and are eight
times as likely to use other illicit drugs in later life.
"Our findings are particularly timely given that
several US states and countries in Latin America have made moves to
decriminalise or legalise cannabis, raising the possibility that the drug might
become more accessible to young people"*, says Richard Mattick, study
author and Professor of Drug and Alcohol Studies at the National Drug and
Alcohol Research Centre, University of New South Wales, in Australia.
Cannabis is the most widely used illicit drug globally and
recent statistics have shown that in some countries adolescents are starting
cannabis use at a younger age and more adolescents are using cannabis heavily.
In England, 4% of 11–15 year olds report cannabis use in the past month,
roughly 7% of US high-school seniors are daily or near-daily cannabis users,
and in Australia, around 1% of 14–19 year olds are daily users of the drug,
whilst 4% use weekly.
In this study, a team of Australian and New Zealand
researchers combined individual-level data on up to 3765 participants who used
cannabis from three large, long-running longitudinal studies to find out more
about the link between the frequency of cannabis use before the age of 17 years
(never, less than monthly, monthly or more, weekly or more, or daily) and seven
developmental outcomes up to the age of 30 years (completing high school,
obtaining a university degree, cannabis dependence, use of other illicit drugs,
suicide attempt, depression, and welfare dependence).
The researchers recorded clear and consistent associations
between frequency of cannabis use during adolescence and most young adult
outcomes investigated, even after controlling for 53 potential confounding
factors including age, sex, ethnicity, socioeconomic status, use of other
drugs, and mental illness. Importantly, they also noted that the risks
increased relative to dose, with daily cannabis users showing the strongest
effects.
According to the study's lead author, Dr Edmund Silins,
"Our results provide strong evidence that the prevention or delay of
cannabis use 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 effects on adolescent
development."*
Writing in a linked Comment, Merete Nordentoft, Professor of
Psychiatry at the University of Copenhagen in Denmark says, "The
convincing results presented by Silins and colleagues are very valuable and
highly appropriate at a time when several American states and countries in
Latin America and Europe have decriminalised or legalised cannabis and allow
unrestricted marketing of various formulations of the drug. Such changes in
legislation will probably be followed by decreased prices and increased use,
which will lead to more young people having difficulties with school completion
and social and personal maturation, and will increase the risk of
psychosis."
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