Question

arif has recently quit smoking. what benefit can he expect to occur within a few hours of quitting?
blood oxygen levels returned to normal
risk of heart disease cut in half
improved liver health
reduced coughing and congestion

Explanation:

When a person quits smoking, within a few hours, carbon - monoxide in the blood decreases, allowing blood oxygen levels to return to normal. The risk of heart disease reducing by half takes much longer (years). Liver health improvement is a long - term benefit and not immediate. Reduced coughing and congestion occur over days to weeks as the body clears mucus and heals the airways.

Answer:

blood oxygen levels returned to normal