We replaced our natural gas pack & water heater with electric but stayed with our gas logs. We haven't used the logs since the December 2004 ice storm for any period of time. We would turn them on to check things out but over the years didn't need them.
This past winter when we had the snow, hubby turned on the logs. They were cut off outside where the valve is located. When he cut them on there was a fizzing/sizzling noise coming out from around the valve. He came in and turned the logs on and the odor was terrible. Daughter came in and questioned the bad smell in the house. So we turned the logs off and called YC Gas Company.
In the meantime outside the house the fizzing/sizzzling was still going on when hubby cut off the valve and it was smelling bad. The gas company said it wasn't their problem that we needed to call a heating contractor. They had no answer for why the terrible smell or what would happen if someone walking down the road where the valve was located threw a lit cigarette near the leaking gas.