Switch? Who says a large portion of pot smokers aren't already drinking...or dropping acid or shrooms...or tooting coke or crank...or smoking cigs? You would be shocked at the open-mindedness (ahem) of pot smokers.
But I can see how your self-admitted lack of REAL experience in the REAL world of drugs might have a tendency to foster illusions.
Switch? Who says a large portion of pot smokers aren't already drinking
Wrong question. The right question is what proportion of drinkers would take up pot and abandon booze if pot were legalized. Since pot does not result in hangovers or vomiting, I'd bet a significant proportion.