When plastics burn, they emit phosgene gas, since phosgene is one of the chemicals used to make plastics. Phosgene gas is nerve gas used in chemical warfare since WWI. It is only slightly less toxic than the another well known nerve agent Sarin. The gas will permanently harm or kill you by inhaling it. And like any nerve agent, it can be easily absorbed thru the skin. Interesting fact: When you hear about deaths in a fire attributed to "smoke inhalation", it's usually not the smoke that kills, but all the plastics burning in the house.