is marijuana less harmful than tobacco
Researchers found that marijuana has the lowest risk of mortality and is safer than the commonly used alcohol and tobacco as well as the rest of the drugs in the study. They determined the risk of mortality by comparing the lethal dose of each substance with a commonly used amount of each substance.
Marijuana smoke is an irritant to the lungs, similar to tobacco smoke. Marijuana smokers have the same respiratory problems as tobacco smokers, including an increased risk of lung infections, although no increased risk of lung cancer has been described to date in the medical research.