Electronic Cigarette consists of some micro-electronic components such as airflow sensor, control circuit, executive circuit, high-power integrated circuit, high-frequency ultrasonic sounder, atomizing chamber mask, built-in lithium ion battery, by which it can carry out such high-tech humanized functions as airflow sensing, smoke simulation, smoke temperature simulation, standby at any moment. Meanwhile, as far as the biological technology is concerned, it can make smokers enjoy the same pleasure as that of traditional cigarette when inhaling the nicotine smog droplet, imitating the whole process of smoking. RUYAN electronic Cigarette creates a healthy smoking cultural atmosphere, and has been eulogized by authoritative experts as the perfect combination of modern micro-electronic technology, biological technology and the conception of healthy life. In the body of RUYAN eletronic cigarette, low thickness nicotine liquid enters atomizing cell after ultramicro atomizing pump pressurizing and is supercritically atomized into about 0.5-1.5um fog drops in the high-frequency untrasonic vibration field. Then the smog droplets will be dispersed into aerosols by the inhaled airflow and finally the aerosol will be formed into vapour which simulates the cigarette smoke. Before supercritical atomizing, the liquid should be heated up to reduce its surface tension to the extent of easiest atomizing. RUYAN electronic cigarette not only simulates cigarette smoke but also the temperature of common cigarette smoke (50-60 °C), which is similar to common cigarette and can refresh and satisfy the joviality and long-term psychological habit of smokers so as to achieve humanized healthy smoking; and at the same time, it simulates cigarette and does not contain such hazardous substance as carbon monoxide, nitrogen dioxide, hydrocyanic acid, acrolein arsenic, lead, hydragyrum, perishing the harm of second-hand smoking to surrounding crowd so as to achieve the authentic humanized smoking. Smokers who decide to abstain from smoking can use RUYAN cigarette to fulfill their purposes. The RUYAN cigarette are made into four basic tastes such as the high, medium, low and naught nicotine thickness to meet different requirements of smokers. According to the theory of WHO-recommended NRT, ‘4-step smoking abstention’ procedure is designed to make smokers reduce their physical demand for nicotine to zero unconsciously by ceaselessly decreasing the inhaled nicotine volume and to avoid of incretion disorder and abstention syndrome generated by sudden smoking cessation so as to fulfill the purpose of non-anguish smoking abstention, which can not be achieved by other substitutes of cigarette. Four steps: Step 1: Starting with high nicotine thickness cartridge of RUYAN ATALC and use it for six weeks following normal smoking habit; Step 2: Then switch to medium nicotine thickness cartridge of RUYAN ATALC for twelve weeks following normal smoking habit; Step 3: Then alternate between the medium nicotine thickness cartridge and the naught nicotine thickness cartridge of RUYAN ATALC for four weeks. Step 4: Finally, quit smoking by using the naught nicotine thickness cartridge of RUYAN ATALC for three more weeks