Electronic cigarette is mainly composed of four parts: tobacco (including nicotine, essence, solvent, propylene glycol, etc.), heating system, power supply and filter tip.

A new study from Queen Mary University in London shows that for those who have been unable to quit smoking for a long time, e-cigarettes can help smokers quit smoking better than traditional drug-assisted methods and nicotine replacement therapy. The paper was recently published in addiction, a top ......