After stopping smoking
Smokers who want to quit often do not really think through what they are going to do after stopping smoking. Smoking 20 a day at 5 to 8 minutes each takes up nearly two hours. That is a lot of time to fill. If you don't give them something to do after stopping smoking, they will start to think about cigarettes again.
Usually, the smoker needs to find something to substitute for the action of smoking, because the desire for a smoke is often triggered by outside circumstances. The external event can be anything. Smokers reward themselves with a cigarette when they finish something: when they get a coffee: and when they just need to get away from a situation. The substitute needs to be something that is socially acceptable, can be done almost anywhere, and takes about the same time as a smoke.
Design a substitute for after stopping smoking
They need some physical thing that can act as a substitute for a cigarette. Specifically, the smoker needs something that will give them a stimulus in their mouth, something to do with their hands, and something that lets them move physically to some other place. Their behaviour after stopping smoking needs to mimic what they did before stopping smoking.
The easiest thing to do is to get them to brush their teeth. The act of brushing their teeth means they have to put something in their mouth, and they get a tingle from the toothpaste. They also have to hold the toothbrush. This gives them something to do with their hands for a few minutes. They have to go to some place with water. This means that they are taken away from whatever trigger was reminding them to smoke.
For the more determined smoker, you can set them a challenge. Tell them that every occasion they used to smoke, what they now do is go outside and run around the block. This takes about the same length of time. This will really take their mind off it, and will remind them of why they want to stop.
You can think up other substitute activities to fit each individual smoker.
These simple techniques will help smokers get over the unfamiliarity of the first few days. And leave them fit or with lovely fresh breath as well!