Norman, It seems you really like to abstain from your smoking habit. Its so good that u are well confident to yourself. Most important to quit smoking is realization of self assessment. You are strong enough at this point of view. If you have been smoking for any length of time, smoking has become linked with nearly everything you do – waking up in the morning, eating, reading, watching TV, drinking coffee, etc. It will take time to "un-link" smoking from these activities.

That is why, even if you are using a nicotine replacement, you may still have strong urges to smoke.One way to overcome these urges or cravings is to recognize rationalizations as they come up. A rationalization is a mistaken belief that seems to make sense at the time but is not based on facts. You are probably recognizing many of this common rationalization whatever already you are feeling & thinking (feeling bored everywhere, no fun without smoking....)

Yes, for this worst life threatening habit you missed your good opportunity. Don't think you wouldn't come up once again. Just be steady. Here are some tips given below to help you keep your commitment to quitting:

* Avoid people and places where you are tempted to smoke. Keep off visiting some more days at your friend's house. Later on you will be able to handle these with more confidence.

*Try to alter your habits, daily routine as well as take a different route to work such as exercise or do hobbies that keep your hands busy Switch off alcohol or coffee some more days. It might knock your nicotine craving habit. 
*. If you feel that you are about to light up, Take a time .Delay yourself. Wait at least 10 minutes. Often this simple trick will allow you to move beyond the strong urge to smoke.

* Tell your family, friends, and co-workers that you are going to quit and want their support. Ask them not to smoke around you or leave cigarettes out where you can see them.

* You can buy some nicotine replacement products without a prescription such as nicotine patch, gum or lozenges which can be used discreetly to quickly satisfy cravings. The antidepressant drug bupropion can help control nicotine cravings. It's available as a prescription stop-smoking aid under the brand name Zyban. It's best to consult your health care provider (e.g., doctor, dentist, nurse, pharmacist, psychologist, or smoking cessation coach or counselor) to decide which product — or combination of products — may be best for you.