Smoking is haraam but it does not invalidate wudoo’
Question

What is the Islamic ruling on selling all kinds of tobacco? I smoke but when I hear the muezzin I enter the mosque. Do I have to repeat my wudoo’, or is rinsing out the mouth sufficient? I know that smoking causes various diseases.
Praise be to Allah.It is haraam to sell tobacco because it is evil and causes a great deal of harm. The one who does that is regarded as a faasiq (rebellious evildoer). It is not essential to repeat wudoo’ after smoking but it is prescribed to get rid of the foul smell from the mouth by using something that will take it away. It is also essential to hasten to repent to Allaah from that. End quote.