How will my addiction effect my teenage son?

No way to know. If he is lucky, he will reject the behavior as appropriate and not model you. More likely, he will imitate and copy your behavior. Since addiction is heavily influenced by genetic factors and heredity, there is a higher likelihood of him also developing addictions.
Children suffer. There is a higher prevalence of depression, anxiety, eating disorders and suicide attempts among coas than among their peers. In addition, coas are 3-4 times more likely than others to become addicted to alcohol or other drugs themselves. There is a link for your benefit - talks about parental view of this situation - http://www.Coaf.Org/family/parents%20in%20recovery/affectkid.Htm.