Introduction:
Since electronic cigarettes (e-cigarettes) became available on the market, they have gained unexpectedly a large popularity, especially among young people.

Objectives:
The aim of current study was to evaluate the trends of e-cigarettes and tobacco use over the 3 years period among youth from Poland.

Methods:
A cross-sectional study was conducted between 2014/2015 (N=3552) and 2017/2018 (N=2509) among secondary and high school students from Piotrkowski district. The anonymous, self-administered questionnaire adapted from the Global Youth Tobacco Survey was implemented to collect data.

Results:
Despite the amendment of Tobacco Control Act regulating e-cigarette use among youth, the percentages of the secondary school girls who currently use that products has been increased over 3 years period (from 20.7% to 31.7%; p<0.001). Among high school students that percentages have not been changed significantly (p>0.05). What is more, the prevalence of current smoking of traditional cigarettes was stable among secondary school students and increased among youth from high schools (from 25.1% to 27.9%; p <0.05). Among the younger students the decrement in dual use (smoking of traditional cigarettes and e-cigarettes use) has been noted (from 40.6% to 16.8%; p<0.001) whereas among the older boys the increasing pattern of dual use has been identified (45.7% vs. 56.8% p<0.01%).

Conclusion(s):
E-cigarette and tobacco use is widespread in the investigated population. There is a need for further research and preventive measures to protect the youth from that exposure.

Funding:
This study was supported by the Local Government of the Piotrkowski District (grant number: AZ-I.033.2.2014), Medical University of Lodz (grant no. 503/6-024-01/503-66-001. The funding bodies had no role in the design of the study and collection, analysis, and interpretation of the data, and in writing the manuscript.