varries for diffrent people, i'll still cough if i take a huge ass hit (or if i'm smoking rapidly with someone, like me and my bro sometimes will do this: person 1 takes a hit and passes it, person 2 immediately takes a hit, and as he's almost finished person 1 blows out their hit, person 2 passes joint/bong/pipe w/e when they finish their hit and person 1 hits it, and this is done as fast as possible...) by the time you get done with the bowl/joint you're pretty fucked up... but your lungs are shot for awhile...