Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You sort of did learn this reading with the vocabulary word 煙, but this one is just different enough where we thought we should make a mnemonic for this one:
All this smokiness is from a terrible chemical (けむ) spill that happened nearby. It was acid, so it burned everything up real good, causing the air to get pretty smoky.
The entire town is smoky now due to the wildfire.
The smoky fireworks made me cough.
It’s so smoky! When the heck are you going to quit smoking? This really smells awful.