I've had a few of those little 14/15/20w preheat chokes get smoked
A 2xF40 RS went up in smoke in my bedroom (it had been thermal-cycling for months before that, but I thought nothing of it since I'd seen lights in school do the same)
Had a few of the little ballast/choke things in those LOA F40 shoplights go up in smoke.
A 2xF32 electronic RS ballast in a fishtank light was probably the most recent smoker..
(most electronic's I've found "just die" which is far better)
Those sketchy LOA capacitive sidac things sure did tend to release the magic smoke. Forgot about them and the normal-power-factor rapid start ballasts that would thermally cycle with 34 watt 'energy saver' lamps.