Scientific studies have still not proven that smoking marijuana causes cancer. There are still no confirmed deaths due to marijuana use in its 5000 years of usage. Nonetheless smoking burnt plant matter isn’t exactly good for your lungs. For this reason many people concerned about their health will use a marijuana vaporizer. What happens is that the element in the vaporizer will heat the THC to the point that it vaporizes. Since THC burns at a lower temperature than the plant matter you are able to inhale only the vapor and avoid any carcinogens present in the plant matter. These are also quite common with medical marijuana users who don’t smoke, or may aggrivate a condition by smoking.