E-cigarettes are nicotine products. Minors are prohibited from using them. Non-smokers should not try them. Pregnant women and breastfeeding women, patients with cardiovascular and respiratory diseases are prohibited from using it; please use it reasonably according to your own situation. If you experience any uncomfortable reaction, please stop using it immediately; please follow national laws and regulations, and do not use it in public places and clearly indicate that smoking is prohibited use e-cigarettes and related products in places.