Another word on oil lamps: they can and do leave behind a chemical odor. It is incumbent upon the user to make sure the odor does not build, and that windows should be open to some degree to purge out the fumes. In winter time, this can be problematic for several reasons. One: The newer home being built to high efficiency levels are near air tight. This can be very problematic.
Because winter is a time you obviously do not want open air coming in, the problem of a house not breathing comes into play. (Eventually the unintended circumstances come into play). I refer to the high efficiency homes having the issue of being air tight.
Homes built prior to the mid 1990s are not of high efficiency standards and such, this means that they do not have air flow of any great degree. This translates to home without air flow and have burning oil lamps or candles, burn up the oxygen.