Oh sure, but it's very common to have a minor leak in your home and be relatively unaware.
Just by nature of natural gas service existing you're being exposed to leaks by your municipality. It's better to be rid of it entirely. Washington DC, for example, has over 5,000 leaks. Boston leaks ~50,000 tons a year.
I suspect 50 years from now natural gas will be remembered as fondly as leaded gasoline is today.
