I know quite a lot of people smoke weed, and I have heard of some play GT5 and smoke, but I can't see the pleasure link myself, like booze, even if you can't feel a performance difference in GT5 there are always easy to see real time numbers telling you how crap you are driving in terms of lap time.
There is something to be said in being relaxed, and even some scientists saying it improves driving standards. But it's hard to control. Better to do it in GT5 than real life driving though.
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If this thread is closed then the drinking one would have to be closed too, if it's based on illegal activities. Drinking is illegal is some countries and this is an global website. Smoking weed is legal in some countries.
But the whole site would have to close it illegal activities were banned from being discussed, for example all female members would have to never post on GTplanet as that is illegal behaviour in some countries, females are not allowed to participate in discussion or have internet access for example. So, there you go.