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They also noted that some components of tobacco combustion are absorbed into the blood stream, via the oral mucosa or the mucosa of the lung alveoli, and these components could then be exhaled, leading to a strong odor

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We investigated with voltage-clamp experiments, effects of aqueous extracts (coffees) of unroasted and roasted coffee beans on the activity of human brain nicotinic acetylcholine receptor (nAChR) subtypes expressed in Xenopus oocytes, looking at complex brews, low molecular weight (LMW) fractions, and specific compounds present in coffee