YOU CAN QUIT SMOKING Central Institute of Psychiatry. Ranchi Cigarettes are full of poison. Tobacco smoke contains over 4,000 chemicals as well as tar and nicotine, There is also the gas carbon monoxide, ammonia and arsenic. At least 43 of the chemicals in tobacco smoke are known to cause cancers of the lung, throat, mouth, bladder and kidney. Tobacco smoke also contributes to a number of other cancers. Nnicotine is the addictive drug in tobacco, and the mixture of nicotine and carbon mono oxide in each cigarette you smoke temporarily increases your heart rate and blood pressure, straining your heart and blood vessels. This can cause heart attack and stroke. It slows your blood flow