sure, but its not really socially acceptable to drop X at the company happy hour. also mistakenly falling into a G Hole at the local BBQ is generally frowned upon. Having a couple beers is unlikely to lead to career or social suicide.
IF the "few beers" turns into ONE too many, it will lead to the same career and social suicide. Driving under the influence, fighting, lewd acts, etc... I live in a state where Weed is legal. I don't see people high decide to fight everyone at the party. I have seen this with alcohol more than I care to admit.