Problems With Smoking | LIVESTRONG.COM

Problems With Smoking | LIVESTRONG.COM: "Nicotine is an addictive drug that is legal and harmful. The damage that smoking nicotine does to the body accounts for an estimated 443,000 deaths, which is nearly one out of every five deaths each year in the United States. People who smoke inhale about 4,000 chemicals, other than nicotine, and more than 60 chemicals known to cause cancer, are found in tobacco smoke. Smoking can lead to an array of health problems, some of which are irreversible."