Review on GRIDMANN Pro Silicone Baking Mat by Heather Armstrong

I've used them twice and both times they came out of the oven smoking which in turn set off the smoke alarm. I'm also worried about chemicals getting into my food because of the smoke. I gave two stars because despite everything they are really non-stick, easy to clean and perfect for my baking sheets. However, based on their reaction in my oven, I've decided to stop using them and go back to parchment paper.