Of the carcinogenic substances in tobacco smoke, which is most damaging to the lungs?

Question

Quizplus · Accepted Answer

Tar is the most damaging substance in tobacco smoke as it contains several cancer-causing agents, including benzene, vinyl chloride, and arsenic. These substances can cause mutations in lung cells and lead to the development of cancer. Nicotine is the addictive substance in tobacco smoke, but it does not directly cause cancer. Endorphins are natural painkillers produced by the body and are not present in tobacco smoke. Nitrous oxide is a gas that is not present in high enough concentrations in tobacco smoke to cause significant damage to the lungs. Carbon monoxide is a toxic gas that binds to hemoglobin in the bloodstream and reduces the amount of oxygen that can be transported to the body’s tissues, but it is not the most damaging substance in tobacco smoke in terms of causing cancer.

Of the Carcinogenic Substances in Tobacco Smoke, Which Is Most