Religion and Smoking

Allah says in His Blessed Book: “… and do not throw (yourselves) with your (own) hands into destruction (by refraining)” He also says: “And do not kill yourselves (or one another). Indeed, Allah is to you ever Merciful” And the prophet (peace be upon him) says: “There must be no harm and no harming.”
Fatwa of the Permanent Committee on Scholarly Research and Ifta in the Kingdom of Saudi Arabia: “Smoking is forbidden. Moreover, planting and selling tobacco is also prohibited because of the great harm it causes. It was mentioned in the Hadith: “There must be no harm and no harming”. Moreover, it is one of the filthy things.” Allah (Exalted be He), says in describing his prophet Muhammad (peace be upon him): “he allows them as lawful At-Tayyibat (all good and lawful things), and prohibits them as unlawful Al-Khabaith (all evil and unlawful things).

Fatwa of the eminent Muslim scholar Sheikh Yusuf Al-Qaradawi on Tobacco smoking

The reported juristic disagreement among Muslim scholars on the ruling concerning smoking, since its appearance and spread, is not usually based on differences between legal proofs, but on the difference in the verification of the cause on which the ruling is based. They all agree that whatever is proved to be harmful to the body and mind is prohibited, yet they differ whether this ruling applies to smoking. Some of them claimed that smoking has some benefits, others assured that it had few disadvantages compared to its benefits, whereas a third group maintained that it had neither benefits nor bad effects. This means that if scholars had been certain about the harmfulness of smoking, then they would undoubtedly have considered it prohibited.