The correct answer is (b). Carbon monoxide and nicotine are the main pollutants in the smoke coming from cigarettes. Carbon monoxide is a colorless, odorless gas that can be deadly if inhaled in high concentrations. It binds to hemoglobin in the blood, preventing it from carrying oxygen to the body’s tissues. Nicotine is a stimulant that can cause addiction and a number of health problems, including heart disease, stroke, and cancer.
Option (a) is incorrect because dioxin is not a major pollutant in cigarette smoke. Dioxin is a toxic chemical that is produced as a byproduct of industrial processes and waste incineration. It can also be found in small amounts in cigarette smoke. However, the levels of dioxin in cigarette smoke are not considered to be a significant health risk.
Option (c) is incorrect because benzene is not a major pollutant in cigarette smoke. Benzene is a colorless, flammable liquid that is used in a variety of industrial processes. It can also be found in small amounts in cigarette smoke. However, the levels of benzene in cigarette smoke are not considered to be a significant health risk.
Option (d) is incorrect because dioxin and benzene are not the main pollutants in cigarette smoke. Carbon monoxide and nicotine are the main pollutants in cigarette smoke.