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Risk Factors of Lung Cancer
Smoking and Cancer | Overviews of Diseases/Conditions | Tips From Former Smokers | CDC
Purpose: Reducing cigarette smoking has been proposed as a method of harm reduction. The effect of smoking reduction on cancer risk has not been studied in Asian populations. Patients and methods: A total of , Korean men, age 30 to 58 years, were stratified into nine groups based on smoking status in and From to , patients were observed and tested for the occurrence of cancer. Results: There was no association between smoking reduction and risk of all cancers.
Health Risks of Smokeless Tobacco
Nowadays, around one-third of adults are known to be smokers, and smoking rates are increasing among the female population. It is estimated that deaths attributable to tobacco use will rise to 10 million by , and one-third of all adult deaths are expected to be related to cigarette smoking. The association between cigarettes and lung cancer has been proven by large cohort studies. The risk of lung cancer development is times higher in lifelong smokers compared to non-smokers.
Smoking is a practice in which a substance is burned and the resulting smoke is breathed in to be tasted and absorbed into the bloodstream. Most commonly, the substance used is the dried leaves of the tobacco plant, which have been rolled into a small rectangle of rolling paper to create a small, round cylinder called a " cigarette ". Smoking is primarily practised as a route of administration for recreational drug use because the combustion of the dried plant leaves vaporizes and delivers active substances into the lungs where they are rapidly absorbed into the bloodstream and reach bodily tissue. In the case of cigarette smoking these substances are contained in a mixture of aerosol particles and gases and include the pharmacologically active alkaloid nicotine ; the vaporization creates heated aerosol and gas into a form that allows inhalation and deep penetration into the lungs where absorption into the bloodstream of the active substances occurs. In some cultures, smoking is also carried out as a part of various rituals, where participants use it to help induce trance -like states that, they believe, can lead them to spiritual enlightenment.