I haven't smoked for 4 weeks now, since I started my grow, I plan on smoking again on my first successful harvest.
In the meantime I've kept busy
* playing chess, my rating has improved significantly from around 1900 to 2000
* playing Quakelive, my rating has improved from 1300 to 1600
* revising my high school maths with intention of doing online university mathematics and mathematical stats courses
* practising my turntablism stuff, learnt a few new scratches
* did quite a bit as a trustee of the building I live in
Overall I've been quite productive, I expect to only smoke again in 3-4 months but then my system will be nice and clean and the first hit will certainly be worth the wait.