Is it normal to blow smoke out of lungs without actually smoking?

There's little air pockets on the sides of your lungs, smoke is getting trapped in them, when you exhale with my mouth closed your lungs expand and the smoke escapes the little pockets.

Well ur obviously a dragon

You consider yourself a light smoker? lol

It's called condensation

Your brain is tricking you into seeing the smoke, probably caused by the way you were holding your breath in. Its called hallucinating.

Your insides are on fire. Quick! Send smoke signals up in the skies for help!

Breath. Is it very cold where you live?