Alcohol slows you down. Alcohol affects your body's responses. It slows your brain which means you are likely to have an accident. Drinking Alcohol can affect our judgment and reasoning that can cause some verbal fight. Because of grogginess it slows down are reaction and upset our sense of balance and coordination, impair our vision and hearing. And make us lose concentration and feel drowsy. So. So drink moderately cause it's not bad to drink, what is bad is over-drinking.
Not only that, alcohol has a permanent effect to the body specially the brain. I've seen so many people who are different as they age, compared to those who do not drink alcohol too much.
Maybe the wear and tear thing effects them so fast, they look older than normal people of their age. What's worst is their thinking, they are not as sharp as before.