My friend talked about using alcohol as a pain killer and how you get trapped by it. When you're going through bad times, it's easy to have a drink or three or four to get through it. His bad times were worse than most by a good margin so his analgesic needs were substantial. He said what happened was that when the pain went away, the booze was still there. Just as Screwtape said, the pain-relieving nature of pleasure had turned into a hunger for that pleasure that outlived the need.That's all well and good, but to put it in practice, you have to be coherent enough to remember to do it.
My friend said that it's in the bad times when you need to fast more than ever. That shocked me, but it made sense.