Is Smoking Prohibited in Islam?
Question

Is smoking cigarettes prohibited?
Praise be to Allah.Praise be to Allah and peace and blessings be on His Prophet.
Understanding the Permissible and the Prohibited in Islam
Smoking is one of the things which has caused a lot of problems and harm these days and it has spread like wildfire. Before we discuss this topic in detail, we should know that Allah the Almighty has divided things in the world into two types, good or permissible (At-Tayyibat) and evil or prohibited (Al-khaba’ith), and there is no third type. Allah says (interpretation of the meaning):
{And He makes good things lawful for them and bad things prohibited.} [Al-A’`raf 7:157]
Health Risks of Smoking: An Islamic Perspective
Considering this fact, smoking can either be permissible and good or prohibited and evil .
Thus, we present some of its characteristics and let the person asking the question see himself in which type lies smoking.

There is no disagreement among the physicians and sane people that smoking is harmful for health. It is one of the major causes of lung cancer and other diseases. It is also one of the major causes of death. Since, it is known that the Islamic law prohibits everything that is harmful for a human being.

Allah said (interpretation of meaning):
{Do not kill yourself. Allah is Merciful unto you.} [An-Nisa’ 4:29]
In addition, His Prophet (peace and blessings be upon him) said:
“There is no harm or causing of harm (in Islam).”
He (peace and blessings be upon him) also said:
“A person will not be able to move on the Day of Judgment until he is asked about … his body as to what he engaged it in.”
Smoking also goes against the saying of the Prophet (peace and blessings be upon him):
“Your body has a right on you.”

There is no disagreement among the physicians and sane people that smoking is harmful for the health of others  who inhale the polluted breath of the smoker. Medical research has proven the harmful effects of smoking mothers on their children.
The offensive smell caused by smoking is a source of pain to the worshippers of Allah among humans and angels . The angels are offended and suffer from the same things that the human beings suffer from. Allah said (interpretation of the meaning):

{Those who cause harm to believing men and women without any reason do a great sin.} [Al-Ahzab 33:58]

The money that is spent on cigarettes is used on buying a harmful thing and is therefore an extravagance. Allah said (interpretation of the meaning):

{… and do not be extravagant wasters. Those who are extravagant are kinsmen of Satan} [Al-Isra’ 17:26-27]
Extravagance (in Islam) means spending on something prohibited.
Spending money on cigarettes is a waste of resources as well. The Prophet (peace and blessings be upon him) said:
“A person will not be able to move on the Day of Judgment until he is asked about ….. what he owned as to how he spent it.”
Is Smoking Prohibited in Islam?
Considering all that has been presented, it can be clearly seen that smoking is an evil among many others. It is not permissible to indulge in it, or buy and sell it, or even to offer it to others.
The Responsibility of Muslims to Quit Smoking
It is incumbent on a person who is addicted to it that he must make all efforts and get whatever necessary treatment to stop it. If the unbelievers have understood the harm caused by smoking and made laws regarding it, the Muslims should be even more eager to stop it and treat those who are addicted to it.
We ask Allah the Almighty to cure everyone indulging in this evil and help him in giving it up. Allah is the Best Guide to the Right Path.
For more details, please see the following answers:
Is Smoking in Ramadan Prohibited?
Does Smoking Break Your Fast?
Does Smoking Invalidate Wudu?