I wish society was mature enough for full legalization, but often those pushing for legalization underplay the negative problems associated with drug use. Particularly for that 'harmless plant' marijuana. A university acquaintance went acute schizophrenic shortly after developing a pot habit, that could be a coincidence but the timing is suspicious. A second cousin became mentally retarded immediately after smoking a joint. He's now a 30 year old who can't tie his own shoes.
Big businesses already have enough power to shape politics, we're still in the process of stamping out cigarettes. I've noticed a lot of smoking on Netflix so clearly they're still working on a comeback. How long until they put coke back into Coca-Cola and funding scientific studies about how a bump a day is actually good for you.
Then there is the seriousness of surreptitiously giving someone an addictive substance, to put the hook into them, which I consider to be interfering to the working of the brain and akin to murder. At the moment the focus is around the drug being illegal as opposed to the deleterious effect it can have. Criminal gangs use this tactic fairly frequently as an alternative to killing someone but I believe it should solicit the same punishment.