Well, weed has helped with my depression and it is an enjoyable pass time. As long as it doesn't keep me from getting my degree, it isn't a problem there. As for cancer, you may have a point. Weed itself does not lead to cancer as with tobacco and the chemicals used in its processing. But burning anything will release carcinogens which may lead to cancer. Back in my own apartment, I usually make edibles, smoke a bong, and mostly use my vaporizer. Vaporizers are the healthiest way, besides edibles, to get THC in your body. It doesn't burn the weed, so no carcinogens. TL;DR It works for me in day to say life and the health effects are minuscule. I work out 5 times a week so that helps.