Hmmm, well the easy answer would be to find an ignition live circuit and connect to that instead.
Trouble is, you start getting into how much current draw there is, how big the fuse should be etc.
What do you want to use it for?
Actually heating the lighter draws a fair bit, but if it's an accessory plugged in there you shouldn't have an issue.
Disclaimer: I am an ex-engines/airframes techy and no diddly about electrics. :roll: