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For example, catechol is one of the most salient co-carcinogens found in cigarette smoke, but it also includes methylcatechols, undecane, decane, fluoranthene, pyrogallol, pyrene and benzopyrene
The CDC states that there is no safe level of exposure to second-hand smoke
Additionally, biomarker-based evidence of cancer risk can be easily investigated through rigorously designed randomized controlled trials to assess short-to-medium-term exposure effects
Over time, this leads to: Damage to lung tissue and air sacs Increased mucus production and chronic cough Reduced oxygen exchange Higher risk of infections Increased chances of chronic bronchitis, COPD, and lung cancer The lungs do have a natural cleaning system