Not all of them contain any nicotine. Is Johnson & Johnson and the rest of big pharma (they are behind the push for all this regulation)required to put such a warning on their "nicotine delivery devices?"
How about caffeine, it's an addictive chemical, and one which is regularly sold to minors - should coffee and sodas have warning labels and age restrictions?
Comparing nicotine addiction to caffeine is a wining issue for vapids. I urge you to keep using it as they are very comparable and your argument resonates with the public.