But that simply isn't true - it's pure ignorance. If cannabis is a problem to mental health then where are all the affected patients? Alcohol sees over 1,000,000 people admitted to our hospitals each year; over 47,000 of which are for mental health issues. Cannabis sees around 750. Scaled up for use, for mental health issues alone, alcohol is around 5 times worse than cannabis. And then cannabis doesn't have any of the other problems which alcohol has which causes the other 1,000,000 admissions.
Therefore if cannabis were legalised, and for argument's sake everyone who drunk alcohol used cannabis instead, we'd see 1,000,000 less admissions each year - imagine how richer society would be from that. We'd even see a five fold decrease in the number of mental health issues which we currently see from alcohol.
Please stop spreading your ignorance therefore CraigieG, everyone is tired of the same lies by now. Sorry.