Just got a new stash in. My best friend in college was a Brazilian who taught me how to drink this stuff. It kept me awake through many late-nite cram sessions. I've been marinated in the stuff ever since...at least periodically.
I enjoyed an afternoon Yerba with the Argentine people who worked next door when I was 25 years old. I tried it again at 50 years old and it just made me jumpy and irritable. A Sudafed pill was just right when I had the sniffles...30 years ago. Now it makes me want to jump out of my skin.
Same with alcohol. I could become a roaring drunk with few after effects when I was young. Now, a little glass of wine puts me in bed, wishing it would just go away. Sigh. Your body chemistry changes as you get older.
Not that I wish I could get drunk, but I can't even drink one beer without it stopping the rest of the day.
Oh well. Being sober isn't a health hazard.