I have been a volunteer in substance abuse/mental health education for a couple of yr. Learnt that drugs/acohol can do permanent demage to human's brain. Heard of a 39 yr-old was sent to elderly home, because of drinking 2 packs of beers every day since he was 16. His symptoms were like having Parkinson disease, losing track of time and judgement, couldn't even take care of himself. Just a thought.