I think some fail to see the real issue here with respect to smoking on a liveaboard. In areas where such drugs are illegal, and there is zero tolerance, doing so may put the entire boat, its owners and all its divers in jeopardy. If one absolutely has to toke on a trip, do it on land and take day trips out to dive(but be careful in those countries where there are stiff fines, imprisonment... or worse!). Personally I think weed should be legal, but I only use it maybe once every 1-2 years (and only when offered at a party). I don't drink a lot either (despite enjoying my wine and Scotch) since I'm either diving or editing video, neither of which I care to do (nor am competent to do) in a mind altered state. I wish they'd ban tobacco on liveaboards myself... nicotine is a seriously addictive drug with far too many identified health hazards to be legal.