Cigarette smoke contains mutagenic chemicals that are in the “probably carcinogenic” or “possibly carcinogenic” categories. In addition to free radicals, cigarette smoke is also rich in combustion toxic gases that can reach a very high concentration and become involved in more radical formation. Smoking increases the risk of cancers of the lungs, bladder, cervix, kidney, larynx (voice box), pharynx (upper throat), nose, mouth, oesophagus (foodpipe), pancreas, stomach, liver and some types of leukaemia. Within this review article we will focus on the correlation between smoking and oxidative stress and the role of smoking in increasing the risk of gastric cancer
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