Release the inner fascist
There are personal horror stories to be told about all kinds of things - booze and other drugs, cars, bikes, physical volence etc. etc. Shit happens. That's life. It's terminal in case you hadn't heard.
However don't lose sight of the fact that no one has the right to tell anyone else what they can or can't do with own nervous system. It's immoral, indefensible, unenforceable and worst of all, it's the slippery slope which we are already sliding down towards a well-meaning fascist state, where we all spy on each other, you can punished for thinking the wrong thoughts and heaven forbid you choose to have an opinion which doesn't have the Daily Mail's seal of approval.
It's my nervous system - you do not have the right to impose your views of right and wrong over what I choose to do with it. I take responsibility for my actions, you take responsibility for yours. Leave your little inner fascist out of it.