I would have to agree with everyone here. Stop now.

Even now, you are creating a dependancy on having something between your index and middle fingers, and having something in your mouth. If you keep it up, that dependancy will grow stronger, and the chemical dependancy will kick in. By that time it will be damn near impossible for you to quit unless you have really strong willpower.

I know how easy it is to do something when you are in your 20's thinking it isn't killing me now, so it can't be that bad. It doesn't help when everyone else does it either, because it leads one to believe that it really can't be that bad. That is kind of where I am now. However, this isn't a good attitude for life, and it isn't one that is easily gotten rid of, trust me.