Cannabis is often seen as relatively harmless, especially compared with other drugs.
But its effects may be particularly important during the teenage years, when the brain is still developing.
Recent research suggests that using cannabis at this age may have consequences that last well beyond adolescence.
Other studies suggest that negative effects on the brain and mental health may extend across the lifespan.
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Author: Dr Jeremy Dean
Psychologist, Jeremy Dean, PhD is the founder and author of PsyBlog. He holds a doctorate in psychology from University College London and two other advanced degrees in psychology. He has been writing about scientific research on PsyBlog since 2004. View all posts by Dr Jeremy Dean