The BBC recently aired an edition of current affairs programme Panorama on cannabis and psychosis. If you missed it, they’ve summarised current research on possible links between cannabis and severe mental illness on their website.
Although most people who smoke cannabis will not develop psychosis, the evidence for a link is now growing. The risk seems greater if users start younger and use in greater amounts.
The BBC website also has a page for those wanting more information or support concerning cannabis use and / or mental health.