The vast majority of that CDC information page is about the health effects of nicotine itself. There's a relative lack of specific information about the health risks of the vapor. "Cancer-causing chemicals" is vague (I live in California, I see prop 65 signs all over the place, I ignore them like every good Californian). "Heavy metals" is also vague - is the amount of tin that I might inhale via vaping actually a problem? Is it significantly more than if I lived in an area with a tin mine or something?

I'm not claiming that vaping is safe in some absolute sense, it wouldn't be surprising if there are some meaningful health risks. I personally do not vape myself because the times I've tried it, I've found getting the vapor into my lungs to be very uncomfortable. But it does seem like it's a strict health improvement over tobacco smoke, given that the CDC can't articulate a specific harm to the lungs caused by vaping.