Bismillahir Rahmaanir Raheem.
Studies in Quran, Sunnah and Consensus of majority of scholars has declared that smoking is forbidden to any believer of Allah and His Messenger. Smoking is harmful in numerous ways.
The makers of cigarettes and other smoking stuff clearly says on it that it’s harmful and can kill and in Islam whatever is harmful to us is forbidden. No one can deny the harm of smoking to the human body. The medical evidence for this is well established and overwhelming. Smoking contains poisonous materials, such as nicotine, tar, carbon monoxide, arsenic, benzopyrene, etc., that the smoker swallows in small proportions. Their harm accumulates with time to result in a gradual killing of the human organs and tissues. We are running from Ebola but fails to know senior Ebola is in smoking substances.
The hazards of smoking to the health are hard to enumerate. Cancer, tuberculosis, heart attacks, asthma, coughing, premature birth, infertility, infections in the digestive system, high blood pressure, nervousness, mouth and teeth diseases, etc., are among the many health hazards that have been strongly linked to smoking by scientists.
This is sufficient to prohibit smoking. Islam prohibits any action that causes harm to oneself or to other people. Allah says (what means): "Do not kill yourselves, Allah is indeed merciful to you Quran 4-29."Do not cast yourselves, with your own hands, into destruction Quran 2:195.
And the Messenger says: No harm may be inflicted on oneself or others. The feet of a human being will not depart, on the day of Judgement, from their standing before their Lord, until they are questioned about five things: his lifetime – how did he pass it, his youth – how did he used it, his wealth – where did he earn it and how did he spend it, and how did he follow what he or she learned. Whoever consumes poison, killing himself with it, then he will he consuming his poison in the hellfire, May Allah protect us from these satanic influences. Aameen.