use of tobacco and their impact
Answers
Tobacco use has predominantly negative effects on human health and concern about health effects of tobacco has a long history. Research has focused primarily on cigarette tobacco smoking
Tobacco smoke contains more than fifty chemicals that cause cancer.Tobacco also contains nicotine, which is a highly addictive psychoactive drug. When tobacco is smoked, nicotine causes physical and psychological dependency. Cigarettes sold in underdeveloped countries tend to have higher tar content, and are less likely to be filtered, potentially increasing vulnerability to tobacco smoking related disease in these regions.
Tobacco use is the single greatest cause of preventable death globally.As many as half of people who use tobacco die from complications of tobacco use.The World Health Organization (WHO) estimates that each year tobacco causes about 6 million deaths (about 10% of all deaths) with 600,000 of these occurring in non smokers due to second hand smoke. In the 20th century tobacco is estimated to have caused 100 million deaths.
The primary risks of tobacco usage include many forms of cancer, particularly lung cancer,kidney cancer,cancer of the larynx and head and neck,bladder cancer, cancer of the esophagus,cancer of the pancreas and stomach cancer. Studies have established a relationship between tobacco smoke, including secondhand smoke, and cervical cancer in women. There is some evidence suggesting a small increased risk of myeloid leukemia squamous cell sinonasal cancer, liver cancer, colorectal cancer, cancers of the gallbladder, the adrenal gland, the small intestine, and various childhood cancers