Smoking is a bad habit. It is also a dangerous habit. Smoking affects the smoker very dangerously. It causes many fatal diseases in his body. It causes cancer, heart diseases, bronchitis etc. Nicotine oftobacco badly disturbs free circulation of blood through veins. It also hampers the supply of oxygen in the body and damages the lungs of the smoker. Smoking irritates the eyes, offends the nose and unsettles the mind. Smoking causes cough in the old age of the smoker. It diminishes the longevity of life. It is a cause of wastage of money. Young smokers sometimes cause various social evils. Even a non-smoker is affected by the smoking of a smoker. Every year a lot of people die because of smoking habit. Smoking is a curse on humanity and so we must prevent it. With a view to preventing smoking, nowadays many organizations are campaigning against it. So, we must save ourselves from this dangerous habit.