cigarette burn blister Figure 4 from burns in forensic medicine Yinon Avior Philipsohn - Cigarette

The environmental effects cigarette butts have can be detrimental

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Tobacco-specific nitrosamines, an important group of carcinogens in tobacco and tobacco smoke

The results provide even more impetus for all smokers to kick the habit. Reference: The effect of smoking on exhaled carbon monoxide and arterial elasticity during prolonged surgical mask use in the COVID-19 era by Ignatios Ikonomidis, Konstantinos Katogiannis, Kallirhoe Kourea, Kostelli Gavriella, Damianos Tsilivarakis, Vaia Lambadiari, Dimitrios Kouretas and Giuseppe Biondi-Zoccai, 7 July 2022, European Journal of Preventive Cardiology