How toxic is burnt plastic?

So in a moment of extreme stupidity I forgot that burning plastic is hazardous and produces toxic fumes. Exactly how toxic is it? I've read it can cause breathing problems, asthma, and lung cancer, but it was a small amount (about the size of my middle finger in both length and width) and once I realized how... show more So in a moment of extreme stupidity I forgot that burning plastic is hazardous and produces toxic fumes. Exactly how toxic is it? I've read it can cause breathing problems, asthma, and lung cancer, but it was a small amount (about the size of my middle finger in both length and width) and once I realized how stupid what I just did was I closed the door to the room and opened every window in the house. Are the fumes so toxic it is going to severely impact my health even though it was a small amount and I dealt with it quickly?
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