Beginning of Essay
Smokers generally feel more comfortable after that especially important first cigarette of the day. Within just a few seconds of "lighting up," smoking activates mind-altering changes. Smokers are well aware of the long-term risks of their habit: such as lung ....

Middle of Essay
.... focused on cigarettes. Nicotine causes smokers' brain cells to grow more nicotinic receptors than normal; therefore, the brain may function normally despite the irregular amount of acetylcholine-like chemical acting upon it. The brain is reshaped: the smoker feels normal with nicotine in his system, and abnormal without it. A series of tests were conducted on nonsmokers, "active" smokers, and "deprived" smokers. The "active" smokers were given a cigarette before each test, while the "deprived" smokers were not allowed cigarettes before tests. The tests started simply, and then moved towards more complex problems. In the first test, subject ....