best things for me were reading, exercise and meditation. the first few weeks will be rough, but after around day 7 or 8 i started to feel better each day. also, the more time you get behind you the more determined and focussed you become. but watch out for the relapse weakness around 3 weeks, and 3 months. as soon as you feel like you want to smoke or drink, push it out of your mind and focus on ANYTHING else.
cycling is a great great thing to do right now. i always rode pretty seriously, but before i quit i maxed out at 20 miles at a time, and only 2 times a week or so. now i am riding a consistent 35-40 4 days a week. i dont mean you should go that far with it, since it is my primary hobby, and has been for some time, but it reallllly gets your mind off of all other things but the next mile. what type of bike do you ride? if you really want a workout, and something that offers a serious amount of focus and determination, switch to a single speed road bike (if you arent already on one). i usually ride a standard road bike, but when i quit smoking i found my rides becoming a leisurely way to kill time and get too deep into my own head, so i switched to a single speed racing setup to cut down on the cruising and really get down to brass tacks. it really worked. now i only ride my single speed.
eating right is another thing to focus on. if you spend all day eating fruits and healthy grains, you can take up a good amount of time with that alone.
reading, like i said, was key for me. just be sure and choose material that is not going to aggravate anxiety or depression.
i also had long, great conversations with my mom, of all people, to clear my head and get a new perspective on stuff. it turned out to be one of the best things i have ever done. if you have someone close who you feel like you may have lost touch with, reconnecting with them can be great and you can find some face to face support.
i spent a lot of time rediscovering things i already knew i enjoyed, like certain movies and books and music. i found that i had all of these things i knew i liked, but i had never really fully appreciated due to the weed fog. i must have read 30 books in 6 weeks at the start. it really helped me get my mind sharp again.
good luck yulok, just keep your spirits up as best you can, be active, and stay focussed and healthy. dont forget that it is going to be hard, but before you know it things will be better, and you will be immensely happy with your choice. its always a good feeling to have folks here pulling for you, and dont forget that we are. also, if you relapse, that does not mean you cant do it... it just means you need to give it another go. dont let that happen and then guilt yourself into giving up. stay on the horse, but if you should happen to fall...