Why do you think adults smoke/drink?

I believe that adults smoke or drink because they want to relieve their anxiety. Some people drink to drown their sorrows or when they've had a long day at work. I believe that for some people smoking reduces stress because of the contents that are in a cigarette. Adult's continue to smoke/drink because they most likely began when they were younger and can't quite stop so easily because they're addictive like a drug.