Marijuana can become psychologically addictive. Not like nicotine, where you could actually have physical symtoms of withdrawal, marijuana withdrawals will consist of not much more than "wanting" more and being emotionally depressed for awhile.
I quit smoking marijuana after being a heavy smoker for about 6 years. I smoked it daily, and the only side effects I've experienced from quitting were increased depression, paranoia, and highly irratible and easily peterbed.
I wouldn't worry about having a small experience with marijuana. I know of a doctor whom got through college by selling and smoking marijuana (hey, it was the 70's) and he's of completely sound mind and very successful. He also is a strong anti-drug advocate now. (how ironic)
I would let this blow over. A majority of people have had encounters with this drug, and a lot of people have tried even more than pot. If you think that you will have problems with it all I can say is to stay away from it. But other than screwing up your life the chances are very slim.
Hope this helped