The evidence reviewed by the committee suggests that cannabis use is likely to increase the risk of developing schizophrenia, other psychoses, and social anxiety disorders, and to a lesser extent depression. Heavy cannabis users are more likely to report thoughts of suicide than non-users, and in individuals with bipolar disorder, near-daily cannabis users show increased symptoms of the disorder than non-users.
Links
[1] http://www8.nationalacademies.org/onpinews/newsitem.aspx?RecordID=24625
[2] http://www.rethinkpot.org/tags/mental-health
[3] http://www.rethinkpot.org/tags/smoking
[4] http://www.rethinkpot.org/tags/study-0
[5] http://www.rethinkpot.org/tags/science-engineering-medicine
[6] http://www.rethinkpot.org/tags/2019-legislation