Introduction:
In Japan, recently not only smoking rates but also the consumptions of cigarettes are decreasing. Raising problem about tobacco is increasing users of tobacco vaporizers. To clarify points of problems, present situation of tobacco vaporizers was investigated.

Subjects and Methods:
Data of tobacco vaporizers are collected from internet, newspapers and so forth.

Results:
Tobacco vaporizers are a kind of e-cigarettes. Three vaporizers are available in Japan. They are IQOS, ploom TECh and glo. Most popular vaporizer is IQOS in Japan. One of the reasons that cigarette smokers change to IQOS is that it is allowed to use in some non-smoking places and restaurants. And it is advertised that negative health effect for the circumstance is smaller than that of cigarette smoking. As there are small evidences about negative health effects, regulations are depend on the local governments. The Ministry of Health, Labour and Welfare has not yet presented any policy for the vaporizers because of almost no evidence for their negative health effects.

Discussion:
IQOS began to be sold since 2016 all over Japan. 80 % of its users all over the world is Japanese. The number of its user are rapidly increasing in Japan. Some of the users believe that using vaporizers is not smoking. But the vapor of it contains tars and other harmful materials like cigarettes. To diffuse facts of the vaporizers is necessary and regulations should be made by the precautional principles.

Conclusion:
To disseminate the knowledge about the vaporizers is necessary in Japan.