There is simply no meaningful research anywhere indicating pot smoking leads to lung cancer. None. It's been used effectively to reduce side effects from chemotherapy, and there IS data supporting that. If you have sensitive lungs you might not want to smoke anything at all, but, interestingly, a study did seem to indicate that cigarette smokers who also smoked pot had LESS lung cancer than those who only smoke tobacco…put THAT in your pipe! I invite Shubert to look things up, but when you have no touchstone of valuing actual facts and reality, everything is relative. It clearly is the fool who equates all "drug use" as the same thing, but for some the simple path is easiest.