Quote Originally Posted by cannabisjoe
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.
4-6 seconds is such an insignificant amount of time, you would have to be talking hit after hit to really give yourself a slight head rush. Assuming THC is absorbed instantly, given the chemical touches the walls of your lungs, then holding it in for even 3 seconds triples the chances of you absorbing all the THC. These couple seconds I believe DO make a diffrence, now understand, im not saying you won't get high if you just blow it out, cus you will. But, the added couple of seconds greatly increase your chances of blowing out THC-less smoke.

Also, if ALL the THC were to be absorbed instantly, note the word all, then contact high would be virtually impossible.