nasty habits

This blog is about the obsession to keep doing something you know is bad for you and finding lame reasons to keep doing it. People call this addiction; I call it a pathetic lack of willpower.
When you're young, you believe you can keep smoking or drinking with impunity, but once you attain the age of reason—say, 40—you know this is not so. The cough won't quit, the metabolism can't keep up, and people you know have died from overindulgence.
Then you start with the "just one."
Right.
This is what happens next.