How do cigarettes damage health?

Cigarettes contain more than 4000 chemical compounds and at least 400 toxic substances.
When you inhale, a cigarette burns at 700°C at the tip and around 60°C in the core. This heat breaks down the tobacco to produce various toxins.
As a cigarette burns, the residues are concentrated towards the butt.
The products that are most damaging are:

• tar, a carcinogen (substance that causes cancer)
• nicotine is addictive and increases cholesterol levels in your body
• carbon monoxide reduces oxygen in the body
• components of the gas and particulate phases cause chronic obstructive pulmonary disorder (COPD).

The damage caused by smoking is influenced by:

• the number of cigarettes smoked
• whether the cigarette has a filter
• how the tobacco has been prepared.