I do.... well, my stylist does. I go to her every two weeks. After rinsing the conditioner out, she doesn't sit me under the dryer because I'll get too dry. I airdry until damp, then she blow dries me (with heat protectant of course). She then hot combs my roots and my edges ONLY (which are all natural) and then flat irons my relaxed strands.
For the first 3 months I was able to make it close to about 11 or 12 days until my roots were unbearable. Now at 4 months, I can only keep that salon look for about 5-6 days. I've now resorted to wearing curly styles.
She knows that I'm a do it yourselfer and asked if I'd ever tried to hot comb my own hair. I told her NO! She told me that I could do it and that she would teach me, in the future. I'm not sure if I even want to do that. I think I'd rather stick to flat-ironing.
I don't think it's the hot comb only that can destroy natural OR relaxed hair but also a flat iron. It's really the heat that is the factor. When I was relaxed, my hair was thin so I can't imaging using a hot comb for my relaxed hair, but that's just me.