Nicotine is the only chemical in tobacco that has been well studies by scientists from all over the world. The following two pictures show the molecule of nicotine and its 3D structure.
When a person smokes, the nicotine will get into our body through mouse, nose, and lungs. The absorbed nicotine will get into our blood, and flow into the brian to comine with a slot, called nicotine receptor. The nicotine receptors are located on the surface of our brain cells. When the receptors are combined with nicotine, our brain cells become excited – we feel excited, too.
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