Legalizing marijuana would make a lot of sense, I don't think there's a single case of marijuana overdose on record and tens of millions of users. It's much less dangerous than alcohol, for example.
If the principle is, "Let's not get lethal substances out to the public", the first one you'd go after is tobacco. The next one you'd go after is alcohol. Way down the list you'd get to cocaine, and sort of invisibly low you'd get to marijuana.
If you want to talk about distributing substances that are lethal, . . . let's be serious. Tobacco is far ahead of anything else. Alcohol is second.