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I quit almost 2 years ago cold turkey from 2 packs a day for 7 years, there are no "3 weeks and you are safe" you will need to resist temptation for the rest of your life, it does get easier as more years pass by.
Also since it is a habit you will find a replacement for it whenever you feel like smoking and it will most likely be food. You will gain some weight, i gained around 20 pounds but it was much needed weight anyway. When you have been without smokes longer than what you have smoked you can consider yourself "safe".
Good luck.
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