You would be able to do that but anything on that circuit will also be on all the time. If you want to do it so you're not making any permanent changes, get two add a circuits that have removable fuses. Remove the fuse from the one you will be replacing the lighter socket fuse with and connect the leads coming off them to each other. Then plug it in and see if your lighter works. If it does, it's connected correctly, if not, you need to flip the add a circuit around.

Good luck.