>>10916634Smokers have indeed a high level of protection for COVID-19, it is hypothesized that Sars-Cov-2 uses the nicotinic acetylcholine receptor to reach the brain, nicotine also binds to this same receptor. Scientists at the university of Pittsburgh discovered that Sars-Cov-2 contains a motif similar to rabies and some snake toxins that also uses the nicotinic acetylcholine receptor. Rumour is that one of the researchers got killed.