Electronic cigarettes, also known as virtual cigarettes and electronic atomizer, are mainly used to stop smoking and replace cigarettes. It has the same appearance as cigarettes, similar to cigarettes, even more than regular cigarettes, and can suck out smoke and suck out feelings and smells like cigarettes. Electronic cigarettes do not have tar, suspended particles and other harmful components, and manufacturers also believe that electronic cigarettes do not have diffuse or lingering secondary smoke. But some studies suggest that electronic cigarettes still have secondhand smoke. Since electronic cigarettes have been lacking in systematic clinical experimental data support, some countries have identified electronic cigarettes as illegal, and some countries have agreed that electronic cigarettes must meet drug standards before they can be sold as smoking cessation drugs. It needs to be explained that electronic cigarettes do not have the effect of clearing away poison, and the discussion about electronic cigarettes and clearing away poison is false and illegal propaganda.