Between 7th & 8th grades. My older brother was a pot head. I was pretty habitual (more days stoned than not) after work/school from 18 - about 24,

when I started getting panic-y instead of high. Didn't smoke anything for about 20 years, but have smoked about 4 times in last 5 years, with pleasant results, except for the last time - panic-y again.