Which problem is shown to increase with smoking?
infertility rates
sperm production
blood oxygen levels
blood glucose levels

A. Infertility rates but smoking could also effect oxygen level because it burns the alveoli in the lungs making it harder to breathe which will show a low SpO2 rate.

Be by his side : ) make him feel better

One health risk and the most important one is obesity, it can cause obesity since you are not leveling your food like you wont ever get full because your just snacking between foods which can also cause diabetes.hope this : )