OP. I think op is thinking of that study where they took a ce4 and pushed to 5 v to it thus creating formaldehyde. Nobody in the real world would vape a ce4 like that. I can't vape my kayfun above 15 watts due to high vg, the coils I build and how I wick. Plus I like a cooler vape in the Kayfun.Who are you referring to? I don't vape my KFL's over 17w.