Answers

Hi Nathan,

If you smell gas. Stop.. Turn off the gas to the fireplace and CALL a licenced Gas plumber ASAP

I had recently answered another question about chimney.  Please do not use if the smell continues and contact The National Associations of Chimney Sweeps to get a certified professioinal out to your home to inspect it before you use it again. 

http://www.ncsg.org/ 

Philip Anderson

Berkeley CA