Who is most at risk from exposure to secondhand smoke? spouse of a nonsmoker child of a smoker spouse of a smoker child of a nonsmoker

The child of a smoker is at risk from exposure to secondhand smoke.

Explanation:

Many scientific articles have been written based on research done over the years. Many of these articles state that if a person was introduced to second hand smoke before the age of 25, are the ones most likely to get cancer or other respiratory diseases. Many of these people were exposed since birth.