More than once, in tents, caravans, boats, shacks, caves, mines and houses. But, IF (and I'll be the first to admit that this is unlikely due to the level of idiot that usually tries to operate these things) - IF the precautions are followed there is a much reduced risk of using gas burners indoors. And most of that revolves around the long-term effects of increased moisture levels which carry combustion by products into the living environment.
If you deliberately operate a gas burning appliance indoors for testing purposes without following the safety precautions you are either trying to rig the test results, don't know what you are doing or deliberately doing it to highlight the issues and how unsafe the practice is.
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