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shit nevermind here's your answer:
so, given your situation, not much would change. if that person held the hit in for ten, even twenty, minutes then they wouldn't get higher then they would've if they had just did it normally. your question now may be why, and a reasonable question indeed. well, all the chemicals and that jazz is absorbed almost completely within the first few seconds of inhaling it. so if that person were to do that, the most it would accomplish would be getting more tar into their lungs.