morex
Bluelighter
You know, I've had a couple friends who seemed totally unable to smoke salvia with any noticeable results. I don't know if it was an issue of technique--I watched them both attempt it several times and there wasn't anything visibly wrong with their form--but they never experienced anything other than a strange body feeling even after several attempts with extract of confirmed potency. However, sublingual administration produced powerful and frightening results for each of them.
I've heard of similar things occurring with DMT (e.g. people being unable to blast off by smoking it but getting launched into another universe by IM/IV administration). Perhaps its due to some variation in the absorbtivity of lung tissue from person to person? Or maybe it's just high natural tolerance rendering smoking impractical as an ROA? I dunno, just thinkin' out loud really.
I have wondered about lung absorption varying as well. I thought about this when high once and I convinced myself that my awesome lungs absorbed more THC than other people's lungs, and that is why I get higher. I'm not convinced now that this is the case, but it is an interesting thing to think about.
Also, I have a few friends who all did salvia and none of them had any effects (smoking 20x+ extracts). I let my friend smoke some of my salvia 10x and she had an incredibly intense experience. I think some salvia just plain sucks.