I was wondering what would symptoms be after being exposed to carbon monoxide over a year?

How big was exposure: Everyone is exposed to some level of CO from traffic, furnaces, cigarette smoke, and industrial processes. There is rarely new symptoms from past exposure as your body clears CO in about 2-3 months. Possible acute symptoms could be headache, dizziness, confusion, chest pain, nausea but if no longer exposed these should diminish and no new symptoms should appear.