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Can Alzheimer's Spread Through Blood Transfusions? Here's What We Know.
(www.sciencealert.com)
General discussions about "science" itself
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If you’re worried about Alzheimer’s just use tobacco. Nicotine is neuroprotective. I’m sure there are lower risk ways to use tobacco, but don’t ask doctors about them.
Smoking is a significant risk factor for Alzheimer's so if nicotine itself helps then it's definitely not by smoking.
If you just want the nicotene, vape. The worst parts of tobacco is in the smoking. (The second worst are in the dipping.)