An 83-year-old man presents to the community behavioral health clinic, where he is diagnosed with Alzheimer's disease by the PMHNP. He currently smokes two packs of cigarettes a day and declines help with smoking cessation. Which medication for Alzheimer's disease is contraindicated in this patient due to smoking status?

Choice A reason: "None" is incorrect because certain medications can interact with metabolic pathways affected by smoking. Choice B reason: Galantamine is metabolized by the CYP1A2 enzyme, which is induced by smoking. This induction can reduce therapeutic levels of the drug, potentially making it less effective or requiring dose adjustment, thus contraindicating its use without careful monitoring. Choice C reason: Donepezil is metabolized primarily by CYP2D6 and CYP3A4 and is not significantly affected by smoking; it remains safe for use in smokers. Choice D reason: Rivastigmine is metabolized by esterases, not CYP enzymes, so smoking does not alter its metabolism, making it safe in this patient.