This isn't quite the same thing, but I ran into this issue when I was having elective surgery. The form asked if I was a smoker. I asked the nurse what I should put since I vape, not smoke. She checked with the doctor and he said they would test me for nicotine the morning of surgery and if I tested positive, they would cancel and keep 50% of my already paid in full fees. So, had I checked the box no since I am technically NOT a smoker, I would have lost several thousand dollars.
Granted, surgery and insurance coverage are two different things, but it still sucks. If your insurance company tests you after you put no, they probably wouldn't be happy regardless of the technicality of whether or not you truly "smoke". I don't know why they don't just ask if you use nicotine products. It's frustrating.