old_blue, I don't know if you smoke or not, I really don't care and I won't make a cute remark like the others have.
I got one of those 12 volt lighters also. What I did was get a six volt lighter from an old junker and replaced the knob with the one from the 12 volt(which worked just fine). I now have a 6 volt lighter that works and has a knob that matches the other knobs.
I don't smoke but I do have a 6 volt lighter that works.