Yes. i.e. 400-500F is much more likely to be harmful to health than 300F. This is why teflon pans are not a good choice for things like searing meat, where you really want the surface to be very hot. Of course, you can still do plenty of cooking at 300F.
Or just preheating oil — you can easily get a pan within that range in just a couple of minutes if you put oil on the bottom and turn the stove on high
