In answer to the second question, smoking tends to suppress the appetite. Therefore, there is a tendency for the appetite to increase once the smoker has stopped.
You can also add two other factors to this. Firstly, the sense of taste and smell become improved after the first 48 hours of smoking cessation. This will obviously increase the urge to eat. Secondly, nibbling seems to be an ideal substitute for the "what shall I do with my hands" syndrome.
There are a couple of ways to deal with this problem. You can obviously offer suggestions of various substitutes or suppression of appetite during the hypnotherapy. However, we prefer to offer Instant Substitutes that the client can turn to should they require them. These can range from the habit of drinking a glass of ice cold water, keeping a bowl of fruit and vegetables handy or chewing gum to suppress any pangs of hunger.
As for the "what shall I do with my hands?" syndrome. We suggest carrying a pen around the they can twiddle in their fingers. Short stubby ones work the best as they mimic the feel of the cigarette. Alternatively, chewing sesame sticks can also help as well as suppressing the hunger pangs.
Hope this helps. As I specialise in smoking cessation, if you require any further tips, please let me know.