Smoke in Ship

I have been accumulating smoke near my kitchen area which is also near the crew beds. There had been fire incidents, due to accidents I think, but those were put out quickly. Does the smoke linger after a fire and what sources of it should I look for. I have a scrubber on the other side of the room. I tried dismantling the kitchen and rebuilding to no avail. Maybe building a vent? Great game, thanks!