Wow, there is quite a lot of misinformation being conveyed in this thread...

THC is the primary compound that provides the trippy effects. THC is a mild hallucinogenic compound. CBD "regulates" those effects.

French inhaling has nothing to do with how high you get - the smoke goes to the same place, and does not get abosrbed in your nostrils. If you believe it gets you higher, then let me tell you that it's just a myth.

Holding your hits in for long periods of time hardly does anything at all (yes, maybe a tiny bit more might get absorbed, along with other toxins that didn't have time to absorb before that)... I have experience with this. I used to hold in my hits - I don't anymore (at least not longer than a few seconds), because I realized that it doesn't matter.

Really, stop worrying about how long you hold your hits in, and just enjoy the ganja.