the first step to take in quitting smoking is to decide to stop it entirely.

Meet a counselor and schedule a session with him or her

follow all his advices

If your the type that can't do other things such as watching football or taking alcohol without smoking, then you give yourself a break from doing those things

Let your family and friends be aware of what your doing because they 
might be of help to you(like reminding you)

if your beign persuade by your friend to smoke, you can come up with one story like your on drug or you have a sore throat