Wouldn't be surprised to find out they smoke more than they used to with it being less scarce.
https://ash.org.uk/uploads/Smoking-Statistics-Fact-Sheet.pdf... https://www.gov.uk/government/statistics/tobacco-bulletin/hi...
We had in the UK the sugar tax which was an effective ban on added sugar in soft drinks - you can hardly buy any drink without artificial sweeteners now, all of the old formulations were taken off the market because they were uneconomical. However, it never prior received attention as a ban, it was always described as just a "tax".
Simply, we should charge for negative externalities (not only for vapes) and let people decide what's valuable to them.