Cigarette smoke is a complex mixture of over 7,000 chemicals produced when tobacco is burned. It contains harmful substances such as nicotine, tar, carbon monoxide, and formaldehyde, which can have serious health effects on both smokers and non-smokers. The inhalation of cigarette smoke can lead to respiratory issues, cardiovascular diseases, and various forms of cancer. When a cigarette is smoked, it releases both mainstream smoke (inhaled by the smoker) and sidestream smoke (released from the burning end). Secondhand smoke from these sources poses risks to those nearby, particularly children and pregnant women, increasing the likelihood of health complications.