Very lucky! I have absolutely no sense of smell and a few years ago I looked after a friends house when they were on holiday. I cleaned their gas hob on last day and left. Unbeknown to me I'd knocked gas on but couldn't smell it. Three days later they come home. She opens door first and he's behind with a cigarette in mouth unlit. He steps in and is just about to light it when she screams at him tommo