I use the plug-ins and had to replace one a few months ago because I bumped against it with my bare leg one day and it felt very hot. I'm extremely paranoid when it comes to fire so I unplugged it immediately. The second one felt warm but nothing like the other so I've left it plugged in. I just checked the replacement and it's warm, the wick is very dark but everything seems okay with it. I've never had one smoke or smell like yours did. I would be afraid to use it. Hopefully the company can help you with it. Good customer service would be to send you replacements free.