Mask wearing amplifies harms of smoking
The study included 40 smokers of conventional cigarettes, 40 exclusive heat-not-burn cigarette users, and 40 non-smokers of similar age and sex. The average age of participants was 45 years, and 72% were women. A similar number of combustible or non-combustible cigarettes were smoked during mask and non-mask periods. In conventional cigarette smokers, exhaled carbon monoxide increased from 8.00 parts per million (ppm) at baseline to 12.15 ppm with no mask and 17.45 ppm with a mask. In non-combustible cigarette smokers, exhaled carbon monoxide increased from 1.15 ppm at baseline to 1.43 ppm with no mask and 2.20 ppm with a mask. Among non-smokers, exhaled carbon monoxide did not differ among the baseline, non-mask, and mask periods.

Source: https://academic.oup.com/eurjpc/advance-article/doi/10.1093/eurjpc/zwac101/6609477?login=true
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