Some people have marijuana withdrawal symptoms, some don't. Just because you don't doesn't mean it doesn't happen. There are many medically proven effects from marijuana withdrawal. I feel most of them when I do not smoke. When I quit I don't eat or sleep for days. I'm pissed off at everyone and everything, and if someone gets in my way it wouldn't be out of the question to beat them to death. I sweat so much I have to change my clothes about every hour.

Consider yourself lucky if you don't feel the same way without weed, but if you think it doesn't happen you're delusional.