Actually it is Dr Tashkin who did a longterm studay and at one time he did beleive thier was lasting damage becasue the effects were immediatly shown after smoking the Cannabis. After this largest longest study done was completed Smoking Marijuana Not Linked with Lung Damage for Cannabis users.
It also showed a preventative measure against Cancers for even longterm smokers more than those who do not smoke at all.
http://healthland.time.com/2012/01/10/study-smoking-marijuana-not-linked-with-lung-damage/
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I'm sorry, but the mere idea that repetitively inhaling smoke of any sort, no matter what has been burned, could do no damage to lungs just fails the common sense test. With all due respect, I think you might be allowing your advocacy to blind you a little.
Could it be that smoking does cause damage, but that the anti-carcinogenic properties of marijuana effectively cancel out the effect?