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E-cigarettes or vapes also contain nicotine and have a comparable or higher nicotine yield than combustible cigarettes

Supplementary Table 5 Correlation (Spearman) between genera in healthy (both TC-H and NTC-H) samples

Cigarettes contain thousands of chemicals, this includes both carcinogens and toxins

Here is a great article that discusses that e-cigarettes do not product 2nd hand smoke

Why is it that some patients with more damage to the esophagus have less heartburn than patients with no damage

Related to this, it was very recently reported that CRP and IL-6 levels were significantly higher among 10,061 atherosclerosis patients subsequently diagnosed with lung cancer than among those not subsequently diagnosed with lung cancer 17