Gras
grasreykingar og líkamsrækt.. ræðið
A major 2006 study compared the effects of tobacco and Cannabis smoke on the lungs.[14][15] The outcome of the study showed that even very heavy cannabis smokers “do not appear to be at increased risk of developing lung cancer,”[15] while the same study showed a twenty-fold increase in lung cancer risk for tobacco smokers who smoked two or more packs of tobacco cigarettes a day.