What is the impact of tobacco smoke on indoor air quality?

Tobacco smoke significantly impacts indoor air quality by introducing a variety of harmful chemicals into the environment. When tobacco is burned, it releases thousands of substances, including particulate matter, carbon monoxide, formaldehyde, and various carcinogens. These pollutants can persist in the air and adhere to surfaces, contributing to the deterioration of overall air quality.

Harmful chemicals from tobacco smoke can lead to a range of health issues, particularly respiratory problems, cardiovascular diseases, and even cancer. It affects not only the smoker but also individuals who are exposed to secondhand smoke. The presence of these toxic compounds can linger in enclosed spaces, making indoor air more hazardous to health.

Given the known adverse effects that tobacco smoke has, especially its ability to degrade indoor air quality substantially, it is clear why the answer indicates that it contains harmful chemicals that worsen IAQ.