depends on the type of weed I'm smoking:

mids - i could hit it a thousand times and not get high

regular dro - bout 8 hits

the haze - bout 4 hits to feel it, 6 or 7 and I'm baked

the purp - bout 2 to catch a buzz

the kush - 1 hitter quitter, but i do 2 or 3 just for the heck of it