I didnt grow anywhere near the time of the Vietnam War, but "Hash" as certaintly not disapeared from the market. As far as "Tai Sticks" being prevalent, more than the likely the so called "Tai Sticks" were really grown locally. In the New England about 100% of Marijuanna is grown in New Hamshipe and Vermont, and if your lucky you might get a good connection to get some from Canada. But of course everyone always brags about how they got an eighth of "Red Hair", "Afghani", "Tai Stick" when it isnt even close, its just really good bud grown locally. But "really good bud grown locally" just doesnt have the same ring to it as "TAI STICK". And once it has a name on it, it starts selling.
I'm not doubting that G.I.'s smuggled weed, but smuggling weed halfway across the world is hardly cost effective against a farmer in New Hampshire who grows stuff just as good and puts the same fancy name on it.