>>21578853
leaf and bark powder from a plant indigenous to south east asia that contains alkaloids which exhibit low potency opioid activity. the desired, positive effects plateau at a relatively low threshold, so it's pretty safe in that regard (can't overdose fatally, can't increase dose for better effects very well).
it is kinda addictive and can lead to mild withdrawals when stopping, but it's a league below the usual drug habits in my experience.

>Also does this apply to oolong or whites, or only specifically greens?
I've been wondering about this. some teas are very harsh on my stomach, while others don't have this issue at all. I remember reading something about the compound contained in tea which causes this effect, but I forget what that all was about.