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The accuracy of self-reported cannabis and tobacco dose per joint is poorly characterized and has never been investigated following acute cannabis/tobacco exposure

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Canadian regulations are relatively straightforward when it comes to carrying tobacco products

Evidence that cannabis smoke alters susceptibility to respiratory infection is lacking but its overall effect on immune function as noted above suggests the cannabis smoking may predispose susceptible individuals to pulmonary infections, including those that are immune compromised by human immunodeficiency virus (HIV) or cancer chemotherapy [133, 169]

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