Fatwa : Smoking in the Mosque

Q : What is the ruling on smoking in the mosque?

A : Smoking, in itself, is permissible and not prohibited, due to the absence of a proof indicating prohibition.
     If smoking in the mosque leads to harming the people of the mosque or some of them then it is not permissible.
     If smoking in the mosque does not cause harm to anyone in the mosque, then there is no sin upon the smoker in it.
     If smoking in the mosque leads to people’s denunciation, reviling the smoker, blaming him, and tearing away his cover, then it is not permissible, for a believer must guard his reputation. It has been related from ʿAlī (peace be upon him): “Leave what people denounce—even if you have your excuse for it.”

- Syed Muhammad Abdullah Awad

Source : Min Thimār al-ʿIlm wa al-Ḥikmah vol.1