“My son keeps vaping. How will this affect his lung health?”

I found a vape pen in my son's drawer while putting away his clothes. When I questioned him about it, I found out that he vapes quite frequently--like in the house and sometimes at school. I know this is really bad for you and I am going to try and make him stop doing this as soon as possible. If he continues vaping, how will it affect his lung and overall health?