Why do people are not quitting cigarette smoking?

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There are approxiamately 4,000 chemicals in cigarette smoke, many of them toxic. The ingredients in cigarettes affect everything from the internal functioning of organs to the efficiency of the body's immune system. The effects of cigarette smoking are destructive and widespread. Toxic ingredients in cigarette smoke travel throughout the body, causing damage in several ways. Nicotine reaches the brain within 10 seconds after smoke is inhaled. It has been found in every part of the body and in breast milk. Carbon monoxide binds of hemoglobin in red blodd cells, preventing affected cells from carrying a full load oxygen. Cancer-causing agents (carcinogens) in tobacco smoke damage important genes that control the growth of cells, causing them to grow abnormally or to reproduce too rapidly. The carcinogen benzo(a)pyrene binds to cells in the airways and major organs of smokers. Smoking affects the function of the immune system and may increase the risk for respiratory and other infections. There are several likely ways that cigarette smoke does damage. One is oxidative stress that mutates DNA, promotes atherosclerosis and leads to chronic lung injury. Oxidative stress is thought to be the general mechanism behind the aging process, contributing to the development of cancer, cardiovascular disease and COPD. The body produces antioxidants to help repair damaged cells. Smokers have lower levels of antioxidants in their blood than nonsmokers. Smoking is associated with higher levels of chronic inflammation, another damaging process that may result in oxidative stress. If these are all the effects, but still why the Philippine Government allows the importation of cigarettes?