I haven't ruled out that they were trying to target youth with their products, but having nice juice flavors is the furthest thing from a smoking gun, and yet it was presented as one.
People do make these arguments, and they catch on from time to time. There was a moral panic about alcopops in the 1990s in the UK [0]. They weren't banned by regulators but several supermarket chains stopped selling them.
The government increased the tax on alcopops several times, but in the 00s the big drink companies started promoting Swedish i.e. sugary cider. Now your 1990s alcopop has some ös in the name and 10% added apple juice.
(Referenced paper: http://tobacco.stanford.edu/tobacco_main/publications/JUUL_M...)
Juul bought ads on socialstudiesforkids, dailydressupagames, and collegeconfidential: https://www.nytimes.com/2020/02/12/health/juul-vaping-lawsui...
I would assume a significant difference in impact between putting flavor substances in your lungs and putting flavor substances in your esophagus/stomach.