Its not CHEMICALLY addictive, but it is physically addictive, but then again isn't everything? Chewing gum constantly will make you wan't to keep chewing it when you can get it, so the same can go for any other substance, atleast thats my opinion.

Anyway, since you said you used to do it seldomly, and now your doing it very often, then its probably just cause your getting used to the whole being able to get it whenever you wan't thing. I stopped smoking 4 years, and now I've got a hookup and I've been smoking almost everyday, when I used to smoke like 1-2 times a month. The only thing that scares me is my tolerance level going up too much, I don't wanna have to waste all my weed, since lately I haven't been feeling really stoned when I smoke.

If I were you, I wouldn't worry. But if you think you have no self control, then just smoke the rest of your stuff, and don't do it anymore for a month or two, and prove to yourself that you aren't addicted. I quit for 4 years, so I know I really don't need it, but its nice as hell getting high when theres nothing else to do.