Pulmonary Effects of Cannabis

"For physiological and pharmacological reasons,61 smoking cannabinoid herbals does not seem to have a similar health hazard profile as tobacco smoking, aside from the potential for bronchial irritation and bronchitis. Smoking cannabis was not associated with an increased risk of developing chronic obstructive pulmonary disease ..."

Source: 

Aggarwal, Sunil K., "Cannabinergic Pain Medicine: A Concise Clinical Primer and Survey of Randomized-controlled Trial Results," Clinical Journal of Pain (Philadelphia, PA: February 23, 2012), p. 4.
http://www.ncbi.nlm.nih.gov...

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