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Don't mean to sound dumb, but do glass pipes come standard with a choke? When do you hold the choke and when do you let go?
If by choke u mean carb ( i dunno if its supposed to be called choke or carb but everyone i know says carb) then you are supposed to hold it until your about to end the hit then u let it go to clear the smoke left over in any kinda chamber in your pipe. Most glass pipes come with carbs (chokes) even if they dont have a large chamber cause they look nice and u can scrape your resin out through them. :D