Publicity Page . The report also concluded that smoking is the leading cause of stroke and the third leading cause of death in the United States. It is both a stimulant and a sedative to the central nervous system. Nicotine is readily absorbed whether it is smoked or chewed. Stress and anxiety affect nicotine tolerance and dependence, and more nicotine is required to achieve the same effect as one's tolerance to nicotine escalates.
Withdrawal symptoms are common for smokers who go periods without cigarettes.
One study conducted by the National Institute on Drug Abuse resulted in subjects with behavior changes that included anger, hostility, aggression, and loss of social cooperation. Cigarette smoke also contains many gases, most notably carbon monoxide and tar. The tar in cigarettes has been know to cause a high rate of lung cancer, emphysema, and bronchial disorders. The Environmental Protection Agency has concluded that secondhand smoke causes lung cancer and greatly increases the risk of respiratory illness in children and sudden infant death. If you are interested in quitting, it is recommended that you speak to your doctor concerning the type of smoking cessation program that takes into account your complete medical history.