(Answered) Sam has been smoking for years and finally wants to quit

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Sam has been smoking for years and finally wants to quit. His provider prescribes wellbutrin, a medication that binds nicotine receptors. How might this be effective?
A 16 year old is scheduled to give a speech in high school. She gets very nervous and almost passes out. The school nurse gives her a paper bag to breathe into for a few minutes. Why would this be helpful?

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