Nonstick Pan Ruined in High Heat? I bought a nonstick Greenpan at Williams and Sonomo. It was kind of expensive like $100.  It was working great.  Then someone used it on high heat.  Now it sticks a lot.  Visually, I don't see anything wrong with the pan, but it seems to be totally broken.

I'm surprised that using it just a single time with high heat was enough to ruin the nonstick surface entirely.  

Was this my fault? Or should an expensive nonstick pan be a bit more durable than that? (I am new to cooking so sorry if it's a newbie question.  Any info appreciated!)
Yes high heat can burn off the nonstick coating.

My roommate's girlfriend did one of my pans that way, heating it very hot while dry.  It was pretty spectacular.  Everyone in the house had this weird little cough like from dilute pepper spray.  Anything silver in the house tarnished.  I presume the nonstick was burned off and floated around in the house, causing these effects.  The pan was still usable after, just no longer nonstick.