about tolerance

i dunno about that man =\. for me, that's a session or two, but for so so so many of my friends, they need to take several to the face to obtain the high i did from a fraction of one.
i dont know how physical or mental it is, but i know it doesn't just work out as "the more you smoke, the more tolerance you have". I've been doing this a long while, and i'm seeing absolutely zero tolerance, infact, i'm becoming more easily high.