I have read research that suggest up to 90% of the time a joint is lit--no one is puffing, rather it is "slipstreaming" away. Which kinda makes sense, say 5 seconds for a normal puff, and what??, maybe 10-20 puffs per joint (some roll fatties and others roll pinners)? That equates to 1-2 minutes of "casual puffing" and how long does it take to smoke a joint (including the normal stoner babble)? LOL, in some circle of friends it took 5-10 minutes to smoke up a joint (no hotboxing). Now if we used the legendary Oat Willies "Power Hitter", that joint would be gone in less than 3 minutes...with zero slipstream smoke. Ahhh, those were the days we would smoke our brains out until we were "straight", lol!
Power Hitter thread---https://www.icmag.com/ic/showthread.php?t=201430
Power Hitter thread---https://www.icmag.com/ic/showthread.php?t=201430