Hi, I was wondering if I should go to the clinic/hospital because a little while ago I was burning a piece of plastic, and I took a quick little sniff of the smoke that came out. I would say I only sniffed a little amount, but I was wondering if doing that was something I should go to the hospital for?

How long ago was this?

I honestly wouldn't be too concerned. If it was just a little smoke, that it should be relatively harmless. There is probably a heck of a lot more pollutants in the air you breathe normally.