What are the harmful components in cigarettes?

The harmful components in cigarette smoke include alkaloids such as carbon monoxide and nicotine, amines, nitriles, alcohols, phenols, alkanes, olefins, carbonyl compounds, nitrogen oxides, polycyclic aromatic hydrocarbons, heterocyclic compounds, heavy metal elements, organic pesticides and so on. They have many biological functions, including: 1. Inflammatory stimulation to respiratory mucosa: such as aldehydes, nitrogen oxides and olefins. 2. Toxic effects on cells: such as nitriles, amines and heavy metal elements. 3. Addictive: alkaloids such as nicotine. 4. It is carcinogenic to human body, such as benzopyrene, cadmium, dimethylnitrosamine and β-naphthylamine of polycyclic aromatic hydrocarbons. 5. Can promote cancer, such as phenolic compounds. 6. Make red blood cells lose the ability to carry oxygen, such as carbon monoxide.