http://www.nytimes.com/2012/02/25/business/another-theory-on-why-bad-habits-are-hard-to-break-shortcuts.html?pagewanted=all&_r=0
Apparently, for people who don't feel much connection to their "future self" (that is, they have a hard time imagining themselves in the future) the parts of their brain that are active when thinking about their future self are the parts associated with thinking ab…