If I may put on my serious hat for a moment, let me reply to that.
Whisky is much stronger than beer. However, it is customary to drink whisky out of tiny shot glasses, while beer is consumed in giant mugs.
Moreover, drugs like marijuana and hash are self-limiting compared to alcohol. No matter if the stuff is weak or strong, at a certain point the user loses interest in having any more, and becomes distracted by other pursuits (or falls asleep on the floor).
I've known very few pot smokers who fell asleep on the floor. Whiskey drinkers - absolutely. Beer drinkers - positively. Most pot users do manage to make it to bed - either their own or someone elses.