Q. What is the Islamic ruling on the one who sells various kinds of tobacco? I smoke, and when I hear the adhaan, I go to the mosque. Do I have to repeat my wudoo’, or is it sufficient just to rinse my mouth? I know that smoking causes various diseases.
Praise be to 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 faasiq (evildoer). You do not have to repeat your wudoo’ 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.
From Fataawaa al-Lajnah al-Daa’imah, 13/57