Personally, I would avoid all three of them, but, if ever legal or decriminalised, I would smoke a meager amount of cannabis, but, once within a very long period of time.

Despite my stances on all three commonly-viewed vices (well, we humans in this age live with a moderate degree of moral relativism), I believe in legalising all of them for the following two reasons:

1) When it is legal, most people won't have as much of a reason to do these kinds of outlets than they would if it was criminalised.
2)Governments can earn a massive revenue from subsidising major companies that deal with this trade.

Your thoughts?

Also, please correct me if I'm misusing words or even ideas.