Unfortunately, it is difficult to accurately study the effects of marijuana on the respiratory system. This is related to the inconsistency in the method of administration between subjects,[7] the illegal nature of the substance leading to problems with nonbiased recruitment, the concurrent use of tobacco in many participants and the often relatively short duration of regular marijuana use compared with tobacco smoking.[12] Nevertheless, it is the opinion of the authors that cannabis smoking has a detrimental effect on the respiratory system in a number of ways, including symptoms, lung function, and possibly carcinogenesis and respiratory tract infections,[13] although the available evidence is conflicting.
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