Received: 15 September 2020
Accepted: 18 August 2021
First Online: 3 September 2021
: This study was approved by the Societal and Social Ethics Committee of the University of Leuven (G-2020-1960). Participants gave their consent to participate at the start of the online questionnaire. When they did not give their consent, participants were thanked for their interest and the questionnaire was finished.
: Not applicable.
: The authors declare that they have no competing interests, but KA, FB and DVG are advocates for Tobacco Harm Reduction (THR).