IslamQA
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Summary (from the source)
Smoking does not invalidate your wudu but you should remove the offensive odour from your mouth.
Question
What is the Islamic ruling on the one who sells various kinds of tobacco? I smoke, and when I hear the adhan, I go to the mosque. Do I have to repeat my wudu, or is it sufficient just to rinse my mouth? I know that smoking causes various diseases.
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah:
It is forbidden to sell tobacco because of its evil nature and its many harmful effects. The one who does that is considered to be a fasiq (evildoer).
You do not have to repeat your wudu after smoking , but you should remove the offensive odour from your mouth with something that will take it away. It is also obligatory to hasten to repent to Allah from that.
And Allah knows best.
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