Why are people so easy-going when it comes to cannabis? Oh wait, I know. It's because it gets you high.
It's a proven fact that in people with a certain predisposition, in the short-term, it can cause early-onset Alzheimers, long-lasting psychosis and, with long-term usage, psychological under stimulation (see: stereotypical pothead). And people who advocate for full legalization dismiss all that with the argument that it can be marginally medically beneficial sometimes. Look, I'm all for enjoying life and have zero problem with people smoking weed, but don't justify it with bullstuff like that.