What is one inhaling into the lungs from a cigarette?

Cigarettes contain three drugs, called Nicotine, Tar and Carbon Monoxide. Tar is a sticky black thing that sheds all the hairs off your lungs and covers the lungs so you can't breathe properly. Nicotine is something that keeps you addicted to smoking and makes you want to buy them even more, also making your heart beat faster. And finally, Carbon Monoxide is also very bad. I forgot what it does though, sorry. Anyway, this is what is in a cigarette. :)