Principle objective of this lecture is to present on Tobacco and its Dangers. Tobacco smoke contains about 1000 chemicals, many of them being harmful. Smoking kills 12 times the number of people killed in road accidents. It contains nicotine which is addictive. Tar is a black sticky substance that forms in the moist lungs. Tar contains 17 chemicals (carcinogens) that are known to cause cancer. Carbon monoxide is a poisonous gas that stops red blood cells from carrying oxygen around the body.