Cannabis users are up to five times more likely to have suicidal thoughts than non-smokers, a new study shows.
The class B drug has long been anecdotally linked with mental health problems, including depression and anxiety.
But a study of more than a quarter of a million young adults in the US, run by the National Institutes of Health, assessed the strength of the connection.
It revealed that around 3 per cent of the population who do not smoke cannabis and do not suffer from depressive ep...
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