I had a bit of a cocaine addiction for a couple years and I can tell you that when you first start out on an addictive drug like that, you think to yourself "wow, this isn't nearly as big a deal as people make it out to be." And then after a while as it dawns on you that you're addicted, you tell yourself "well sure, it destroys some people's lives, but I can keep it under control." And maybe you can, for a while. Some of the people I know who "have it under control" are deteriorating before my eyes.