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Smoking 3-5 cannabis cigarettes is as dangerous as smoking 20 tobacco cigarettes. People who smoke cannabis draw more smoke, inhale more deeply and hold it in the lungs for longer. Cannabis cigarettes have no filter and deliver four times more tar than tobacco cigarettes.
Researchers studied the health of 450 people who smoke cannabis daily but did not use tobacco. They found that people who smoke cannabis have more sick days and more doctor visits for chest problems and other illnesses than a similar group who did not smoke.
Cannabis smoke deposits about 3 to 5 times more carbon monoxide and tar on the lungs than tobacco smoke.