I packed up last new years day, still packed up a year on and it still isnt that easy. I previously gave up for 12 solid years until mistakingly thought (while drunk) Just ONE wont hurt, within in a couple of months I was back on 20 a day.
Determined this time to stay a non smoker, just remember by the summer practically the only placed you will be able to smoke is in your house or in your car.
Re the fags out of the window, I used to do it (sorry) but it annoys me now as its a hazzard, I do 1000s of motorway miles a year and especially at night, if somebody in front throws one out of the window I find myself doing a slight swerve to aviod the fly fag, just a reaction to seeing something heading towards you at speed.
Keep it up , its really worth it