Carbon monoxide in blood stops oxygen from going to the brain and heart and other muscles. Continual use of high level carbon monoxide can lead to various heart diseases. The particulates can cause a variety of health damaging substances especially nicotine - a thimbleful of 60 milligrams could kill an adult if taken at once. One cigarette has one milligram of particulates. Nicotine also rises blood pressure, increases heart rate, and contracts vessels near skin.
Nicotine contributes to the growth of cancer.
17 year old Brandon Vyse smokes Marlboros and Newports because that is what his parents and friends smoke. He has been smoking for 3 years. My parents smoke. My friends smoke. It was cool then.