Two psychologists, James Prochaska and Carlo DiClemente,
came up with a model of how people change harmful habits that may help
you. They found that when people set about changing a particular habit,
like smoking, they don’t always succeed the first time around — instead,
they found that relapse is common and forms part of their overall model
of change.
http://www.huffingtonpost.com/bernadette-farrell/how-to-give-up-giving-up_b_5827570.html