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you got in trouble with a pencil, you caught a pen on fire... no more!
There are lots of different plastics, and they will give off lots of different vapours when they decompose.It could be just a simple hydrocarbon, or it could contain cyanides, or PCB's, or lots of other substances. Without knowing what the plastic was (including what additives might have been incorporated), it would be difficult to know what are the likely volatiles it would create.It is unlikely that the small amount you have breathed in would have done you harm, but volatiles given off from plastics in house fires are a major cause of death.
Hmm.. What made my see-through bit of the pen go black though? It rubbed off with a tissue, but there were black chalk like things around it