It won't be wrong to say that smoking is one of the leading causes of cancer in the world. According one study nearly half a million people die every year due to smoking related cancers. Smoking is not only harmful for respiratory system but, for almost every organ of the body and also lead to the deterioration of the one's quality of life. Around 90% of lung cancers in the world are due to tobacco smoking in the form of cigarette, cigars, hookahs etc. The other types of cancer which can be caused due to smoking are cancer of mouth, larynx, pharynx, esophagus, cervical, bladder, kidney, stomach, pancreas, bowel and ovarian cancer. Excessive smoking can lead to impotency in both the genders. It can also cause acute myeloid leukemia and can be one of the risk factor for several heart diseases. All together smoking effects ones physical as well as mental wellbeing.