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I also think the arguments against the flavored juices are hysterical/hypocritical given the variety of flavors of liquor one can find."
If you have a product that people enjoy using and has associated dangers, some people will use it anyway. If you have a second product that replaces the first product with less danger[1], more people will use it. That's simple economic reasoning.
The hysteria over vaping is largely a product of a puritanical mindset---the horror at the thought of someone, somewhere, enjoying themselves. People have made their peace with tobacco itself[2], alcohol[3], and marijuana[4].
[1] "Evidence so far indicates that e-cigarettes are far less harmful than smoking as they don’t contain tobacco or involve combustion. There is no smoke, tar or carbon monoxide, and studies looking at key toxicants have generally found much lower levels than in cigarettes. They do contain nicotine, which is addictive, but isn’t responsible for the major health harms from smoking." (https://www.cancerresearchuk.org/health-professional/awarene...)
"In September, a paper in The Journal of Clinical Investigation described mice exposed to e-cigarettes for 4 months, nearly one-quarter of their life span. Farrah Kheradmand, a pulmonologist at Baylor College of Medicine in Houston, Texas, who led the work, says that, at first, "There was absolutely no emphysema, nothing" in the animals that inhaled aerosol from e-cigarettes. That finding jibes with earlier research showing combustion products are the cause of airway inflammation in smokers." (https://www.sciencemag.org/news/2019/11/how-safe-vaping-new-...)
[2] Ever seen one of the bans on the sale of vaping products associated with a similar ban on cigarettes? I didn't think so.
[3] Here's a toast to those who collect the statistics on the externalized costs of anything.
[4] Smoking marijuana has exactly the same dangers as smoking tobacco. (You do have a filter on that reefer, right?) The same particulates, the same "tar", and the same assortment of combustion by-products, right?