Hi, I am 15 and admitting to smoking marijuana for a few weeks. I did research to find they found no connection between lung cancer and marijuana smoking (Only recently I found information which contradicts this, which lead me to quit.) which is why I started to smoke in the first place. I estimate only about 14 grams was consumed and I worry about having lung cancer. I have stopped smoking and never plan to smoke again, it's not worth it to me. I think I may be being paranoid about it because cancer frightens me to death, and I believe I am feeling 'something' but not pain in my lungs and i only noticed after I began thinking about cancer so I think it could be psychological. I heard it takes years to develop cancer through smoking, but still I worry. I have 2 family members who I know have had cancer, one bowel, the other kidney.