LYCOS RETRIEVER 
Zyban: Chances
built 634 days ago
It is not physically dangerous to smoke and use Zyban at the same time. However, continuing to smoke after the date you set to stop smoking will seriously reduce your chance of breaking the smoking habit.
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It takes about 1 week for Zyban to reach the right levels in your body to be effective. So, to maximize your chance of quitting, you should not stop smoking until you have been taking Zyban for 1 week. You should set a date to stop smoking during the second week you're taking Zyban.
Source:
It is not physically dangerous to smoke and take Zyban at the same time. However, continuing to smoke after your goal date to quit smoking will seriously decrease your chances of smoking cessation.
Source:
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