Smoking can do more than ruin your health, rot your teeth and make you look a lot older than you actually are. Smoking can make you smell bad, too. When you inhale, smoke enters your lungs and works its way through your system. Tobacco smoke contains over 7,000 chemicals and chemical compounds. Some are destroying your insides, while others are eventually expelled through your skin. When you quit smoking, your body smells better -- and you'll probably live longer, too [source: CDC].