At present, electronic cigarettes appearing on the market are roughly divided into two categories. One is smoke-type electronic cigarettes, which are mainly composed of lithium battery packs, atomizers and cartridges ; It is a heating and non-burning electronic cigarette. The typical representative is IQOS. The principle of using polyimide heater sheet to bake tobacco, polyimide heater sheet is thin, light in weight, can be bent into a chimney size, polyimide The electronic cigarette made of the heating sheet is small in size and convenient to carry, and is also the favorite of smokers.

According to statistics from relevant agencies, in recent years, the global smoking population has shown a downward trend, and the e-cigarette population has increased significantly, from about 7 million in 2011 to 35 million in 2016. According to market research firm Euromonitor International, it is estimated that by 2021, the number of adult e-cigarette users will increase to 55 million.

As an emerging product, e-cigarette has achieved rapid development in the past decade. In 2010, the global e-cigarette market was approximately US$416 million, and its market capacity expanded to US$7.1 billion in 2016. In the past six years, the market capacity has expanded by 17 times and the annual compound growth rate has reached 60.5%. It is expected that the e-cigar industry will continue to maintain a high growth momentum in the future. By 2024, the industry will reach US$45 billion, with a compound annual growth rate of 26%. The rapid growth of e-cigarettes will inevitably lead to the replacement of traditional tobacco. In 2015, the global sales of tobacco products was US$698.5 billion. According to this calculation, the proportion of e-cigarettes in the tobacco industry in 2015 was about 0.7%. Assuming that the traditional tobacco industry grows at an annual rate of 3%, by 2024, e-cigarettes will account for more than 5% of the total tobacco industry.