I have actually tried three times and the third time stuck. The enjoyment was gone, the daily withdrawals became unbearable, and my health was failing with inflamed liver. Once you get a health diagnosis all the B.S. Stops. You either stop or die in the not so distant future.
My first try was 2010, second in 2013, and did it so far in 2014.
I lasted 10 days in 2010, 7 days in 2013 and I am almost four months in 2014. Stopped at 32 years old.