He notes that a much smaller recent study from new

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He notes that a much smaller, recent study from New Zealand did claim to find a link, but only in very heavy users. He says, “The authors’ interpretation of their data can be faulted because of the small numbers of their subjects exhibiting such heavy use, which rendered their estimates of risk imprecise.” Why smoking marijuana and smoking tobacco should have such different effects on the lungs is still a matter of dispute. Many researchers believe that it’s simply a matter of dose: most marijuana users smoke a few times a month, while most cigarette smokers light up multiple times a day. But Tashkin argues that specific properties of marijuana also matter. He says that THC has anti-inflammatory and immune suppressing properties, which may prevent lung irritation from developing into chronic obstructive pulmonary disease (COPD), a devastating lung disorder frequently caused by tobacco smoking. As for cancer, he says, “the THC in marijuana has well-defined anti-tumoral effects that have been shown to inhibit the growth of a variety of cancers in animal models and tissue culture systems, thus counteracting the potentially tumorigenic effects of the procarcinogens in marijuana smoke.” Whatever the cause, it seems that those who argue that marijuana is harmful because of its smoke are going to have to find a different line of attack. Read more: - marijuana-not-linked-with-lung-damage/#ixzz1or2EtPce
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