Cannabis: scientists call for action amid mental health concerns

Warning reflects growing consensus that frequent use of the drug raises the risk of psychotic disorders in vulnerable people

" Q&A: the risks and effects of cannabis

Global public health campaigns are needed to make clear the risks of heavy cannabis use, particularly for young people who are more susceptible to mental health problems, senior drugs researchers have said.

The call for action from scientists in the UK, US, Europe and Australia reflects a growing consensus among experts that frequent cannabis use can increase the risk of psychosis in vulnerable people and lead to a range of other medical and social problems.