Marijuana is not something that individually I am a fan of nor that I support the usage of. I do not claim that it cannot be dangerous. However, prohibition has proven to be greatly ineffective in general on all accounts. On top of that, I cannot imagine marijuana presenting any more of a problem than alcohol which is notably very dangerous. It should be legalize, taxed and age restricted.
Weed is not harmless. Long term use can lead to psychosis, it can also stop people from being motivated and turn them into listless coach potatoes. We already have many damaging and unhealthy products on the market why would we add another? People should spend their time working on products which do positive things for people and not negative things.