Here in the US the dangers of gas stoves has been all over the news recently. I wondered if these gasses might impact B12 levels and found this:
One particular, and new, issue: nitrogen oxides, or NOx. These are gases that, outdoors, come primarily from vehicles and power plants and that can cause some of the haze associated with smog. But growing research suggests that gas ranges can also emit NOx, possibly at levels more than double the standard for outdoor air set by the Environmental Protection Agency.
Is this the same nitros oxide that affects your B12 levels?
I hope not, I love my gas stove. I don't want to have to get an electric stove.