http://www.cancer.org/docroot/PED/content/PED_10_2x_Smokeless_Tobacco_and_Cancer.asp
Why Is It So Hard To Quit?
Smokeless tobacco delivers a high dose of nicotine. An average dose for snuff is 3.6 mg, for chewing tobacco, 4.6 mg - compared to 1.8 mg for cigarettes. Blood levels of nicotine throughout the day are similar among smokers and those who use smokeless tobacco.
A report in the Journal of the American Medical Association calculated that smokeless tobacco users ". . . who use dip or chew 8-10 times a day might be exposed to the same amount of nicotine as people who smoke 30-40 cigarettes a day." Stopping smokeless tobacco use causes symptoms of nicotine withdrawal that are similar to those smokers get when they quit.
In a study of Swedish oral snuff users, many of the participants said they were addicted to snuff, and they reported having as much trouble giving up smokeless tobacco as did cigarette smokers trying to quit smoking. Evidence also suggests that when regular snuff users can't use snuff, they will smoke cigarettes to satisfy their need for nicotine.
How Nicotine Affects the Body
Nicotine is a drug found naturally in tobacco. It is highly addictive, as addictive as heroin and cocaine. The body becomes physically and psychologically dependent on nicotine, and studies have shown that users must overcome both of these to be successful at quitting and staying quit.
Nicotine affects many parts of the body, including your heart and blood vessels, your hormonal system, your metabolism, and your brain. During pregnancy, nicotine freely crosses the placenta and has been found in amniotic fluid and the umbilical cord blood of newborn infants. Nicotine is metabolized mainly by the liver and lungs, but a small amount is excreted by the kidneys. Nicotine is broken down by the body into the by-products cotinine and nicotine-N'-oxide.
Nicotine produces pleasurable feelings that make the tobacco user want to use more and also acts as a depressant by interfering with the flow of information between nerve cells. As the nervous system adapts to nicotine, tobacco users tend to increase the amount of tobacco they use, and hence the amount of nicotine in their blood. After a while, the tobacco user develops a tolerance to the drug, which leads to an increased use over time. Eventually, the tobacco user reaches a certain nicotine level and then keeps up the usage to maintain this level of nicotine.
Why Is It So Hard To Quit?
Smokeless tobacco delivers a high dose of nicotine. An average dose for snuff is 3.6 mg, for chewing tobacco, 4.6 mg - compared to 1.8 mg for cigarettes. Blood levels of nicotine throughout the day are similar among smokers and those who use smokeless tobacco.
A report in the Journal of the American Medical Association calculated that smokeless tobacco users ". . . who use dip or chew 8-10 times a day might be exposed to the same amount of nicotine as people who smoke 30-40 cigarettes a day." Stopping smokeless tobacco use causes symptoms of nicotine withdrawal that are similar to those smokers get when they quit.
In a study of Swedish oral snuff users, many of the participants said they were addicted to snuff, and they reported having as much trouble giving up smokeless tobacco as did cigarette smokers trying to quit smoking. Evidence also suggests that when regular snuff users can't use snuff, they will smoke cigarettes to satisfy their need for nicotine.
How Nicotine Affects the Body
Nicotine is a drug found naturally in tobacco. It is highly addictive, as addictive as heroin and cocaine. The body becomes physically and psychologically dependent on nicotine, and studies have shown that users must overcome both of these to be successful at quitting and staying quit.
Nicotine affects many parts of the body, including your heart and blood vessels, your hormonal system, your metabolism, and your brain. During pregnancy, nicotine freely crosses the placenta and has been found in amniotic fluid and the umbilical cord blood of newborn infants. Nicotine is metabolized mainly by the liver and lungs, but a small amount is excreted by the kidneys. Nicotine is broken down by the body into the by-products cotinine and nicotine-N'-oxide.
Nicotine produces pleasurable feelings that make the tobacco user want to use more and also acts as a depressant by interfering with the flow of information between nerve cells. As the nervous system adapts to nicotine, tobacco users tend to increase the amount of tobacco they use, and hence the amount of nicotine in their blood. After a while, the tobacco user develops a tolerance to the drug, which leads to an increased use over time. Eventually, the tobacco user reaches a certain nicotine level and then keeps up the usage to maintain this level of nicotine.