Allah Taãla says in the Noble Qurãn, 'You are the best of nations sent to man. You command good and forbid evil and you believe in Allah'. (Aali Imraan).
Allah Taãla states that one reason for this Ummah being titled as the best of Ummah, is the practice of commanding good and preventing evil'.
Allah says, "And forbid them what is bad." - (Surah Al-'Araf, 7:157)
"O ye who believe! Intoxicants and gambling are an abomination of Satan's handiwork. Eschew such abominations that ye may prosper." - (Surah Al Ma'idah, 5:93)
"And slay not the life which Allah hath forbidden..." - (Surah, Al-Isra, 17:33)
"And make not your own hands contribute to your destruction." - (Surah, Al-Baqara, 2:195)
"Nor kill or destroy yourselves for verily Allah hath been to you most Merciful." (Surah, An-Nisa, 4:29)
Prophet Mohammed (peace & blessings of Allah be upon him) said: "Nor be hurt or injure others."
It is scientifically proven that the exhaled smoke of the smoker is hazardous to non-smokers around him.
Breathing of smoke caused by someone else is known as "passive smoking". It is also known as involuntary smoking or second hand smoking. Approximately 50,000 non smoker deaths from heart related issues can be linked to passive smoking each year.
Allah says: "But squander not your wealth in the manner of a spend thrift, verily spendthrifts are brothers of evils." - (Surah, Al-Isra, 17:26, 27)
The amount of money a smoker spends on cigarette smoking in a period of 30 years is calculated to be Two Hundred Thousand Dollars or more. All this money is simply wasted (not including the money spent on smoker's health care).
Suggestion: Quit this evil act, repent to Allah and do not stay around such friends;
The Qur'an informs us that on the Day of Judgment there will be people who will bite their hands in regret that they were lead astray because of choosing wrong people as their friends, they would say;
"Woe to me! Would that I had never taken so-and-so as a friend! He indeed led me astray from the Reminder (this Qur'an) after it had come to me.' (The Glorious Qur'an 25: 27)
Therefore; Smoking is absolutely Haram, and Allah knows best
"Any good is from Allah & the mistakes were from myself"