This study began in 2012, when people started using electronic cigarettes as a smoking cessation tool.
A relevant questionnaire on the subject was sent to many vapers, with 3105 responses recorded, including a proportion of 2763 vapers who were at least occasional smokers.
In 2021, another questionnaire was sent to these 2763 participants, eliciting 1141 responses.
A study of the responses from these participants showed that 375 of them were still vaping in 2021.
The study then focused on analysing changes in this group of 375 vapers.