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Smoking harms nearly every organ of the body. Smoking can affect the respiratory system, circulatory system, the immune system, the musculoskeletal system, the sexual organs, etc.

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Smoking causes significant changes in your lungs and airways. Some changes are sudden, lasting just a short time. Colds and pneumonia are examples of this.

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Smoking is a major cause of cardiovascular (heart and blood vessel) disease. Smoking and tobacco use are significant risk factors for a variety of chronic disorders.

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Nicotine is a chemical naturally present in the tobacco plant and responsible for tobacco addiction.

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Nicotine is the main addictive chemical in tobacco. It causes a rush of adrenaline when absorbed in the bloodstream or inhaled via cigarette smoke.
Nicotine also triggers an increase in dopamine. This is sometimes referred to as the brain’s “happy” chemical.

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Is smoke from burning tobacco products, such as cigarettes, cigars, or pipes.
Secondhand smoke also is smoke that has been exhaled, or breathed out, by the person smoking.