I know if I came down with lung cancer it wasn't the
vaping it was the 33 years of smoking prior
Precisely. And it's also worth noting that there is some evidence that the benefits of smoking cessation are overplayed: in other words, then, if someone does contract, say, lung cancer after starting to dual use, there's ample reason to start from the assumption that the aetiology of that disease is located prior to commencement of dual-use.
But, in any case, the CDC focus-on-individual cases rather than population effects is a massive, massive betrayal of clinical epidemiology and basic good science, and those responsible should be ashamed of themselves.
But they won't be, because this isn't about science. It's pure propaganda.