About six months ago I made an attempt. I notice now that I seem to really notice the smell of car fumes. I can be walking along the road, and sometimes when a car goes past I really notice the fumes. Not all cars. I live in outer surburbia. I never noticed this before and it is not every car. I mentioned it to my counsellor and she said it was due to the attempt and that I possibly smell them more when I am feeling down. I noticed that I did smell them less when I mentioned about it to her.