Of course marijuana is addictive for some. People waste thousands and thousands of dollars on twelve step programs for all kinds of retarded shit. Some body, somewhere pays money to talk to a shrink because society is telling him he fuckin jerks off too much. let's not lose sight of the fact that it doesn't take a chemical to form addictions.
My theory? People are fuckin' obsessive, man. We find something we like or that makes us feel good, and if a little self-control isn't exercised, habitual habits form. I dont believe in STRONG addictions to any chemical other than Cocaine, Heroin(Morphine,ect..), Oxycontin, Alcohol, and other processed chemicals of that nature. Killing chemicals. Marijuana in it's purest form, still only gives you the munchies... I used cocaine for 5 years, almost daily. I was selling it, and it was there. When I went to prison, I had minor withdrawls, and never thought about doing the garbage again. i see it all the time. i've stood next to friends and chatted with them as they blew. i just dont want it anymore. Some of us are fortunate enough to be "built that way."
I guess my only opinion is... It's all in your head.