Nicotine is also contained in e-cigarettes. Nicotine is harmful to human body. Nicotine is an alkaloid found in Solanaceae (Solanum), which causes damage to the heart, brain and blood vessels, but also to the lungs. Nicotine also has a certain drug effect, depending on how much is absorbed. The electronic cigarette is mainly composed of a tobacco tube evaporation device containing a nicotine solution and a battery. When used, the nicotine solution is heated and evaporated. More and more people are quit for their own body or can quit.