Because a little amount of highly stinky mercaptan is added to LPG used in lighters (and other home applications). If you don't allow LPG to burn fully, you will smell an odor of mercaptan or its combustion products. That is the purpose of mercaptan in LPG - to alert about possible leaks or partial burning, since LPG (or "natural gas" in your stove) istelf is odorless. When you listen about "smell of gas in home" - it is not gas itself, you smell mercaptan addition.

Just sniff a gas from unlighted lighter, you will feel that smell. Hope it's not a revelation for you and you just forgot about mercaptan in LPG.

PS: I have enormous amount of snow here, and every year I dream about sending all of it to somebody who tell that he have no snow, but I afraid it will not survive the delivery. :)

Because a little amount of highly stinky mercaptan is added LPG used in lighters (and other home applications). If you don't allow LPG to burn fully, you will smell an odor of mercaptan or its combustion products. That is the purpose of mercaptan in LPG - to alert about possible leaks or partial burning, since LPG (or "natural gas" in your stove) istelf is odorless. When you listen about "smell of gas in home" - it is not gas itself, you smell mercaptan addition.

Just sniff a gas from unlighted lighter, you will feel that smell.

Hope it's not a revelation for you and you just forgot about mercaptan in LPG.

PS: I have enormous amount of snow here, and every year I dream about sending all of it to somebody who tell that he have no snow, but I afraid it will not survive the delivery. :)