Yes, the scent you smell when the gas flows is a safety feature provided by your gas supplier. After processing, natural gas is over 90% methane, with small amounts of ethane, propane, carbon dioxide, nitrogen, and water vapor. read more
When you first turn on an oven to light it, it is normal to smell the gas for a few seconds. Once the oven is lit and operating properly, the smell will dissipate in short order. If you smell gas before or well after the oven is started, shut everything down and look for a leak. read more