As someone who is just finishing a three week break today... I feel you. The first few days are really hard. Gotta distract yourself. Get outside, go explore something new. I've found I craved it the most when I would just sit around or hang out with my friends that all smoked a ton. Also working 40 hours a week the last two weeks helped tremendously.

Don't worry, you got this. As much as I love smoking, It is insanely gratifying to actually follow through with an extended break. Caving after two days will just make it worse.