its because some people touch random things they see and when they have time they smoke which they will touch the part of the cigarette where the mouth will touch it. which is risky.. but I believe having clean hands before smoking wont make any harm (corona virus) except the effect of nicotineDoctors in France think that smoking can be both good and bad for people who are at risk of contracting the novel coronavirus infection.
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Smoking is a risk factor for COVID-19 patients, but one particular substance in cigarettes — nicotine — might prevent infection in some people, or improve COVID-19 prognosis.
i think it's hoaxnicotine patch can prevent corona virus spreading in cells?