Cigarette smoking has been shown to be one of the leading causes of preventable deaths worldwide. Smoking may also give rise to different types of cancers, the most common of which is lung cancer. However, it can lead to more than 15 types of cancer in other parts of the body, such as the colon, rectum, oesophagus, stomach, pancreas and others. So, how does smoking increase the incidence of cancer?

It comes as no surprise that the number of years one spends smoking affects the risk of cancer accordingly. [...]