Why do people on this website want to tell me that…?

Vaping is not harmful to health? According to them, vapes do not contain any carcinogenic substances and are not bad at all. https://www.aerzteblatt.de/archiv/240830/Toxine-in-E-Kabel-Erhoehte-Krebsmortalitaet-bei-vapenden-Ex-Smokers If they want to defend their addiction, they can do so, but can they question scientifically proven facts?