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Slow acetylator status is associated with reduced ability to detoxify these xenobiotics, but active smokers may have higher NAT2 activity and faster INH metabolism (Kroon, 2007)

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PMID 18442343

This is difficult as the actual externalities are hard to estimate for any product, and no study on the subject exists for marijuana.[63] Not only is it hard to estimate cost related to marijuana use, but external cost is also impacted by substitution

The reasons for these differences include racism, distrust of the medical system, and a lack of minority doctors, experts say
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