Nicotine is the chemical in cigarettes that makes them addictive. About 85% of smokers are addicted to nicotine. Higher levels of nicotine in a cigarette can make it harder to quit smoking. The amount of nicotine in cigarettes has steadily increased in the past decade. Higher nicotine levels have been found in all cigarette categories, including "light" brands.
Some researchers feel nicotine is as addictive as ....... In fact, nicotine has actions similar to ...... and ......., and the chemical affects the same area of the brain.
Depending on the amount taken in, nicotine can act as either a stimulant or a sedative. Cigarette smoking has definite immediate positive effects. For example, it can:
Boost mood and relieve minor depression
Suppress anger
Enhance concentration and short-term memory
Produce a modest sense of well-being
This is why most former smokers who have switched to e-cigarettes or Vapes mentioned further in this article do not wish to quit nicotine!
Most smokers have a special fondness for the first cigarette of the day because of the way brain cells respond to the day's first nicotine rush. Nicotine, particularly taken in the first few cigarettes of the day, increases the activity of dopamine, a chemical in the brain that elicits pleasurable sensations. This feeling is similar to getting a reward.
Over the course of a day, however, the nerve cells become desensitized to nicotine. Smoking becomes less pleasurable, and smokers may be likely to increase their intake to get their "reward." A smoker develops tolerance to these effects very quickly and requires increasingly higher levels of nicotine
Smokeless Tobacco
Smokeless tobacco, also called spit tobacco, includes chewing tobacco (dip and chew), tobacco powder (snuff), as well as flavored tobacco lozenges. These products also contain nicotine.
Smokeless tobacco products allow tobacco to be absorbed by the digestive system or through mucus membranes. Smokeless tobacco contains at least 28 cancer-causing substances, and is not a safe substitute for smoking cigarettes or cigars. According to the National Institutes of Health, chewing on an average-sized piece of chewing tobacco for 30 minutes can deliver as much nicotine as smoking three cigarettes.
Evidence suggests that smokeless tobacco increases the risk of oral cancer, gingivitis, and tooth loss. The risk of cancer in people who use smokeless tobacco is lower than that of smokers, but is still higher than that of people who do not use tobacco at all. Using smokeless tobacco also seems to increase the risk of fatal heart attacks and strokes.
Pipes and Cigars
Pipe and cigar smoking are on the rise. Because pipe and cigar smokers often don't inhale, the common misperception is that they don't face as substantial a health risk as cigarette smokers. Yet recent research finds that smoking pipes or cigars causes harmful health effects similar to those of cigarettes.
People who smoke pipes or cigars are at greater risk for lung damage and COPD, even if they never smoked cigarettes..
From an article by American Council on Science and Health Dr. Murray Laugesen Public Health Medicine Specialist QSO, MBChB, FNZCPHM, FRCS (Edin)
Nicotine is an Alkaloid and many alkaloids can be therapeutic in the right quantities or deadly if abused.