I used to be bang into both smoking and weed, and only decided to give up both just to prove I could, took advantage of a weeks holiday to Florida, and never did either up on my return. Its been five years now and I still don't believe I have truly quit, a Sunday dinner always felt more complete followed up with a ciggie and I miss messing with novas and having a spliff to celebrate and achievement once the job was complete but I can't imagine I'll ever get back into either, a little older and wiser and if I can give any advice its watch your eating, I put on serious weight and have always struggled to shift it, not that I have ever really tried too. A lot of mates still smoke both but I don't see the attraction, bad breath and paranoia are something I can live without, but I don't envy them any more as I know its not doing them any favours in the long term
