put away the cliches... There are over 400 different types of cannabiliods (or different types of THC whatever) each having a different 'effect' on you. Your brain actually has seperate receptors for THC. In fact, the human brain natrually secrets THC durring child birth. THC distorts your conception of time, making child birth a much, much, much, much less of a stressful situaton (to prevent PTSD?).
It is true that the amount of TAR in buf is more then of tobacco. but think of it like this, if your addicted to cigarettes, your going to smoke 4 to 5 times that as much tobacco then as bud. unless your a raging pot head who doesnt do much more then sleep and eat all day (ME)