1) You have to be ready to quit,
tell your self every day that you wan't to quit, research all the health risks, scare yourself silly by looking at pictures of diseased lungs etc etc.
2) Get rid off all tobacco, believe me if you can get it out of the bin then you will.
3) When your cigs don't flush away don't take it as an act of god that he/she still wants you to smoke.
4) Use something to take the edge away, Gum is good, Nicotinell is better than Nicorette. It will still take a LOT of will power also.
5) Use lots of the gum, read the instructions, its ok to use 20 pieces a day. Use it, you'll need it.
6) Tell your friends you are quitting, tell them SERIOUSLY that its not cool to keep offering them to you as a joke or trying to get you to fail. If they do this its cos secretly they are also jealous of your will power and capability to quit.
7) Take up more excecise, this will highlight how bad your lungs are and also help you to repair them and get them working properly again.
8) Excercise will also help keep the pounds off because you will eat more. Try to keep better and healthier snack food in the house. Stuff you can nibble on thats low in cals and good for you, Fruit Veg, rice cakes. Not chocolate and biscuits.
9) Read more, your mind will be distracted and you'll learn more. Even comics.
10) If you live with a smoker this will be very hard but not unachievable.
11) Don't be fooled into thinking 3 weeks down the road its ok to have just one cig. its not. It only takes 1 cig and you will be right back there as if you never gave up. Even a year down the road when you think that a single cig will make you feel so ill, it is still dangerous, your body remembers how to smoke and 1 cig is all it takes.
12) You will feel so much better in just 3-5 days, your lungs will be better, your taste and smell will massively improve! You will cause less wrinkles, your skin will improve, your fingers less yellow.
13) Take note of how bad smokers smell next time you are out and 5 days into quitting.
14) BEST of all, your oxygen intake when skydiving will be much better, you will yawn less on the way up.
15) Remember when stressed, cigs are not the answer, recognise when you are stressed.
16) The cash will come rolling in, In the UK its £4.50 a pack of 20, my habit of 20 a day/extra at weekends, plus my girlfriends habit was costing us £3500 a year. (>$6500). Thus I bought a running Machine.
I have been quit over 2 years now, previously smoking for 5 years. I tried 4 times to quit in the 2 years before and relapsed every time, once even switching to heavy duty cigars and making things worse. Quitting was the the best thing I ever did. I am not a Doctor so heed my advice, but only YOU can do it!