Fact: Wouldn’t that be nice! Smoking is addictive and harmful to you and your loved ones. Nicotine is an addictive drug and causes changes in your brain that makes you want to use it time and again. Cigarettes contain another 3,999 other chemicals besides nicotine, 50 of which are carcinogens. Breaking the habit is very hard but riding your body of all harmful chemicals is well worth it.