I donno about you guys but this is my case:
If I have a whole day to myself, I like to hit 2-3 bowls at once (make hits as close to each other as possible - to maximize the amt of weed per time), then of course I get my high, get to the peak of it, then after a couple of hours I smoke again, a bowl usually, to "bounce the high back up" - but even if I smoke more than a bowl - it NEVER EVER gets me as high again as the first "session" of the day. Basically I get my "original" first high of the day, and after that no matter how much I smoke it just doesn't get me as high... So that's my sad story