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Since you are on Citalopram you may not experience the withdrawal symptoms much.As far as using nicotine patch is concerned you can use it because if you are smoking then you are already combining nicotine with citalopram.I would suggest you to stop smoking without using nicotine patch because please understand it is like going from one addiction to another so it is not beneficial.Stopping smoking is difficult but if you WILL then you can.
All the best.
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