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& Bauermeister, J

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In addition, our results were still significant when we compared the non-age-matched groups, including younger patients who smoked marijuana and who presumably had less lifetime exposure to cigarette smoke. The reasons for the differences between the two groups is likely due to several factors

The risks of respiratory symptoms and of COPD seemed to be related to a synergistic interaction between marijuana and tobacco, but did not occur in cannabis-only smokers