Plan to do things that will keep your mind off smoking. Sometimes our minds can be our worst enemies. They will tell us that we need a cigarette for just about any reason that is handy at the time. By doing things like going to the movies in the non-smoking section, munching on corn or sucking on a lollipop, we can keep our minds occupied and get a break. Go to museums and other places where smoking isn't allowed.
Swimming is a good idea, too.
Quit smoking one day at a time and think only about the part of the day you are in. I am not going to smoke before noon. Sometimes just do it one hour at a time. This is a lot easier than trying to quit forever. Don't subject yourself to smoky situations.