Congratulations on deciding to quit. I can give you some tips. I was a very heavy smoker, 60 a day and quit in 1997 after many times trying. Meanwhile my husband, also a heavy smoker, continued smoking. He quit a few years later. So i figure anyone can do it if they want to. I actully found it a lot easier than losing weight as you have to eat but once you quit smoking you never need to have one again. And feel reassured, despite what some people say, my husband and I do not miss it. If anything, we are embarrassed that we smoked for so long.
It may help you to think about why you smoke. Are you actually addicted to the nicotine? Or is it a habit? I was physically addicted so using nicotine patches got the cravings under control so I could break the habit. What could work for you? What have you learnt from times you may have tried quitting? Don't consider you failed, consider it practise for when you will suceed.
Do think about barriers/risks that could cause problems for you eg. if you have friends you hang out with that smoke, will they support you or blow smoke in your face? Or every time you have a coffee do you want to light up? Think about how you can handle these sitations before they happen. You may need to make some changes to your lifestyle to help you succeed. Maybe have a green tea instead of a coffee for example.
Consider how are you going to motivate yourself. Visualise how fit you will be, or how prematurely wrinkly you'll get if you don't quit. Reward yourself for your sucess, eg. save up the money you would have spent on smokes and buy yourself a treat.
Consider ringing the Quitline as they are trained to help.
And can I leave you with this thought - when my kids were teenagers i said, "Would you like to live in a 2 story-house at the beach?" They got quite excited and said, "Yes." I said, "If your dad & I hadnt been stupid enough to smoke, we could have been there today....."
"Unknowingly, we plow the dust of the stars, blown about us by the wind, and drink the universe in a glass of rain."