I don't. I've read you have to heat it up to well above what you possibly would in a normal kitchen setting before anything toxic gets released (and I don't remember the source of this claim, might be BS altogether).
My reason for not using it is that I think the roasting surface just doesn't get any good with those things. I also don't use a microwave, not because I think it's harmful but it's in my view a machine for making your food taste terrible, I reheat things using the oven.
Same for me. I don't liked a microwave not because of radiation (Perhaps).. I just don't liked reheat it with that machine. I would prefer reheat things using the oven (It will take time than microwave) but hey.. I like the old fashion. The future is getting worse about those easy technology that could cause health issues, it seems.
I will stick with my old way in the past and I will use it in the future for the sake of health or not anyway.