Slang for Mescaline, pretty common for those in the know.
Otherwise know as Mesc, microdot, double barrel and i'm sure a few I don't know.
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Ah. Lophophora williamsii. Never heard that term for it before.
It used to be cheap and plentiful but that was a half a century ago. My buddy bought 1.5"-2.5" dried buttons for $0.15 each in New Mexico and mailed them to Toronto strung as necklaces. He sold them to me for $0.25 each. USD and CAD were pretty much at par back then. A typical button weighed about a quarter ounce and was considered a standard psychedelic dose. Once I ate 15 whole buttons and crossed over into a different reality.
Most so-called mescaline tablets were bogus. I could tell the real synthetic mescaline by its flavor. It tasted like natural peyote even though it was a white powder. A tiny amount (an eighth of a tablet) gave you a pleasant invigorating high without being psychedelic.
Those were the days.
Nothing even comes close.
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I use to buy it by the 100's of tabs at a time and do it every day.
Funny people always said you won't get off if you do it two days in a row but that's a load of crap.