Hi Luanneb,
You must be using a cartomizer or atty that does not have a plastic tip, here are some suggestions.
1. Do not use it as long, allow to cool down between vaping sessions.
2. If it is a cartomizer or one piece atty, cut a hole in the silicon cover for a cartomizer and leave it on, it buffers the heat.
3. Use a lower voltage mod, or step 1.
4. If it is a cartomizer, cut a 901 cart down and remove the cap and silicon washer and use the 901 modified tip so you lips are not touching the steel part of the atty.
Hope this helps,
Anyone else have any ideas?
Dan
Added:
Dang Kent, beat me by 1 minute! LOL