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10.1006/pmed.1994.1026 Transdermal Nicotine Study Group: Transdermal nicotine for smoking cessation

Smoking either traditional or non-combustible cigarettes while wearing a surgical mask results in a doubling in exhaled carbon monoxide and impaired blood vessel function compared to non-mask periods

Steven Mesquiti of Princeton University

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This is not about individual possession

You get breathless more easily than you used to Noticing that you're short of breath climbing stairs, walking at pace, or doing activities that previously felt easy are signs to take seriously