I do have an example, the skytrain station I usually disembark on recently was plastered with vape ads[1][2]. I don't really see why e-cigarettes should need to advertise at all, they could simply be devices suggested to smokers by medical professionals as a cessation aid.

I think we can also look to history when it comes to the flavouring of things, it used to be that medicines would be sweetened to override the natural bitter or acidic tastes of the active ingredients but this led to more abuse of those substances.

[1] https://shawglobalnews.files.wordpress.com/2019/05/vaping-ad...

[2] https://shawglobalnews.files.wordpress.com/2019/05/web-vape-...