Tobacco smoking is a known risk factor for many respiratory infections and increases the severity of respiratory diseases
Smith M, Hosking J, Woodward A, et al
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Researchers analyzed tobacco-related toxic substances in urine samples from over 5,100 people, finding that: 17 Compared with people who had never used tobacco products , e-cigarette users had significantly higher levels of biomarkers of nicotine, tobacco-specific nitrosamines, volatile organic compounds, and metals (cadmium and lead)
But then more information came out
The eugenol present in clove cigarettes makes it more injurious and can cause deep damage to the lungs, cancer, and many heart diseases