Why not? It's fun.

I went about a year and a half not smoking, while hangin out with my smoking friends. All the time saying that I wouldn't try it, 'cause I didn't want to get hooked. After about that time, I went on a weekend with a friend and a bunch of other people. So my friend said, I wanna go for a smoke, wanna join me. I joined saying "I won't smoke, i don't wanna get hooked". So he brings out a small pipe, saying "It's new, wanna try?". Then he continued to explain that the addictiveness of Marihuana is actually about none. So eventually i joined in for a smoke, and have been smoking ocasionally for quite some time now (about 4 years)