mental dependency is also a big factor, but not as bad as physical dependency, i think. and you're right--marijuana doesn't have any physically addicting chemicals...
But yeah, pot isn't as bad as cigarrettes, I think. Less chemicals, carcinogens, meh. Most of the kids I know either:
1.) Hate pot once they try it
2.) Love it, and want more
they're generally stupid enough to keep giving into their appetite for more weed, and they smoke more and more and get into heavier stuff. some people can smoke moderately, but people I know are out of control. meh.
i'm the type of person that gets addicted and attached to things if i like them, so, i'm not going to try it. i'll try not to, at least, heh.