Elisa,
I quit on my way home from Vegas on March 11th at 10:30 am (right when I got off of the airport shuttle). I am on day 12 and it is getting better...still tough, but easier than yesterday, and the day before.
I could not have done it before we went to Vegas, no way! After being there with all of the late night acitivities, drinks, and smoking more than than you normally do, it was almost refreshing & rejuvinating to toss my pack in the garbage at the airport.
You can do it! If I can go for 12 days thus far after smoking for almost 30 years, you can do it!