I would definitely ask your health insurance provider, as the risks are too high if you lose. If you lose, the best thing that could happen is you will be responsible for the difference in the premiums from the time it was switched to the lower rate to the present. If they wanted to get a little more pissy, they could then raise your rates even higher, or even decline to insure you at all. Oh, and if this is through your employer, you could very well lose your job as well. And then they could sue for fraud.
I am not saying they would do all of that, just that it is possible.
Now, I would hope you have a insurer that is enlightened; however, I haven't heard of any yet.
While true that you are not smoking, read the fine print. I saw one the other day that mentions in the fine print that it is nicotine use, not the actual act of smoking that their rates are based on.