Quote Originally Posted by Kokujin X
I read that daily factoid alright, but from my experiance, holding it in like 4-6 seconds does get you considerably higher then just exhaling immidiatly. Mostly with big hits like from bongs, bubblers, blunts, but if its a small toke then I wouldn't even bother holding it. I'v been putting this to the test for a while now and I have to say it's definatly no placebo.
It gets you higher because of the same reason you get lightheaded from holding your breath. You're constantly depriving yourself of air by holding it in for 4-6 seconds. Like studies show once it's fully in your lungs feel free to blow it out.