Yes, I remember Vietnam in 1968. I was the only one in my squad that didn't smoke pot (which was about $1 per "jay", as I recall) on account of not smoking at all. But I got the effect of plenty of second-hand smoke when in the semi-underground bunker where we held our poker games. I made up for not smoking pot by learning to drink whiskey (neat - no mixers or ice available) - Jim Beam, Suntory Genuine Imitation Scotch, whatever... That habit is still with me and my liver has not succumbed. Like most guys in that combat zone, we over-sexed, underpaid teenage killers had to have some way to blow off steam...

BTW, the reason New York City's "Naked Cowboy" is not arrested is that he gets off on a technicality - he wears bikini briefs to outflank the indecency laws.