One of the big problems with prohibition is it restricts choice for the end user. I see a few people in here saying they like lower strength cannabis but get anxious / paranoid smoking skunk. What people call Skunk is really a heavy indica strain, selectively bread for high THC content. Thing is, when THC goes up, CBD goes down in return and CBD is the anti-psychotic side. This is the locked to the couch, no going out sort of high that saps peoples motivation.
A nice light indica on the other hand will make you giggly and talkative. These take a lot longer to grow, so none of the commercial growers are interested.
A proper shop with a good selection and knowledgable staff could negate all of these problems and cut down on the mental heath issues. The tax revenue would be insane too.
They key to enjoying drugs safely is education, not scaremongering. Many town and city centres turn into a no go zone on Friday and Saturday nights while aggressive drunks wander the streets. Perhaps we could get some of these guys on something a bit more friendly ?