That's my take home. I hate being in a room that has no ventilation. I even get pains in my chest quite quickly. So have learned to always throw open windows if possible. All year round I have the kitchen window open when cooking. We don't bother heating the kitchen or bathroom (south UK rarely below 0). And I like to replenish stale air periodically by creating a deliberate draft for a few minutes throughout the house. If not it soon stinks. I am totally repulsed at the smell of burnt toast and lingering cooking smells, so wonder if that's a natural gagging response.