Changing Habits & GTD

[ablaze]

Has anyone here read or thought about whether and how to

1. plan
2. monitor

habit changes with GTD?

You could treat the intention of changing a habit as a project. But more often than not, there are no Next Actions tied to habit changes, as most habits are practiced unconsciously.

I know there is literature about how to change and monitor habits out there and I intend to read one or two books. I'm just curious what you think about this topic.