As we all know, human life is on an extremely fast pace of progress that is made possible by human expeditions and exploration. But no one can say for sure that all the achievements of this progress have been used on the righteous path. Some of these explorations are known as a forward leap in human history just like dynamite that has been used to ease miner’s jobs. But the same invention has also been used as a deadly weapon against thousands of innocent humans. Obviously, Islam did not miss this point about human life and gave advice to all Muslims in this regard: “Islam forbids eating, drinking and consuming things that are harmful to human health. The more harmful it is, the more severe the prohibition of its cause and effect, to the extent that it reaches the level of sanctity.” (1)

Now, we are going to talk about narcotics, the basis of all of the soothing medicine that are used as one of the essential materials in the ancient times surgery but is also used by heedless people for entertainment at the expense of decomposing their body and brain.

Narcotics are the most common cause of death and disability in the world that exacerbates many diseases, including cardiovascular, pulmonary, infectious diseases, cancer, bone diseases, gastrointestinal diseases, hearing problems, and oral diseases. In every 8 seconds, one person in the world dies of diseases caused by narcotics; fortunately, with the advancement of science and technology and optimal information, the level of awareness of people about the effects of narcotics on their health has increased. We will see what advice Islam gave us on the issue of using narcotics for mortal pleasure.

The opinion of some of the leaders of Islam about Drugs

As we said before, Islam forbids consuming materials that are harmful to human health to the extent that even on some occasions it reaches the level of taboo. Imam Khomeini, the first leader of the Islamic Republic of Iran said: "Eating something that is harmful to human beings is forbidden."(1) It is obvious that the criterion for being haram (forbidden) is to have harmed, and it does not matter whether this harm goes through eating or in some other way. Drugs is one of the things that harm human health, but is it harmful to the extent that makes it forbidden to use?

Many physicians and practitioners are following the opinion that narcotics has significant harms and have written numerous books on the dangers and diseases caused by narcotics, especially smoking. Therefore, it can at least be claimed that the harmful effects of smoking to human health vary based on the person and the situation. On this basis, some jurists have considered the extent of the forbiddance of narcotics to the level of absolute religious prohibition. Some other leaders have not seen the extent of the damage to the extent that could lead to an absolute ban on smoking. For example, if a person has heart disease and his doctor strictly forbids him from smoking, smoking is forbidden for him. (2) 

Not only Imam Khomeini, but also Ayatollah* Makarem Shirazi said: It is forbidden to eat or drink something that is significantly harmful to human beings. Smoking cigarettes and other types of tobacco is also haram if it has significant harm, but the use of narcotics is absolutely haram (3), whether in the form of injection or smoking or eating or in any other ways; also the production, sale and assistance in spreading it, is forbidden. (3)

Grand Ayatollah Sistani gave guidance to Muslims in this matter: If smoking and tobacco -though in the future- causes significant harm to the body to the amount that is feared by the wise person, it is haram for being safe from the major harm caused by it. There is no problem with moderate smoking, however. (4)

Conclusion

As we think about this matter reasonably, we surely would understand an important point: 
1. Why should we harm ourselves for a little mortal entertainment?
2. What price should we pay for this kind of entertainment?

Just think and you will see how important abstaining from narcotics is. Live safely in the light of the Quran. 

References:

1. Majma Al-Masayel (third volume – page 65)
2. Islamic Laws (Second volume – page 600)
3. Jame Al-Masayel (First volume – page 578)
4. Islamic Laws (Second volume – page 600)
5. The official site of Ayatollah Sistani

* Ayatollah is an honorific title for high-ranking Twelver Shia clergy in Iran and Iraq that came into widespread usage in the 20th century.

Prophet Muhammad (PBUH & HP) has been sent as a perfect role model for human beings, both in deeds and behavior. This is emphasized in the Quran (33:21) and the sayings of Infallible Imams (AS): “Certainly, in the Prophet of Allah (PBUH and HP) was sufficient example for you and a proof concerning the vices of the world, its defects, the multitude of its disgraces and its evils” [1]. Being mercy to all humans, Prophet Muhammad’s (PBUH & HP) compassion included not only Muslims but every human being. This fact is evident in his manner towards opposers and how he dealt with the followers of other religions that we reviewed some of them in the first part of the topic and the rest will be introduced here.

Preaching the World Powers of that Era

As mentioned in the Quran, Islam is a religion for the people all around the world: “We did not send you except as a bearer of good news and warner to all mankind” (34:28). Hence, it was a duty over the Prophet Muhammad (PBUH & HP) to promote Islam in other parts of the world, too. As soon as his message had been spread in the region of Hejaz, and the Islamic government had been established after the settlement of conflicts among parties in dispute, Prophet (PBUH & HP) received the divine order to universalize his mission (9:33-48:28). Accordingly, he sent several messages to the governors of various countries. In these messages, he neither threatened to war nor obliged them to obey him. Instead, he used kind words to invite them to monotheism (Tawhid). About 185 messages are reported that had been sent to the leaders of countries, heads of tribes, and emperors, which all shared a peaceful approach [2]. 

All the messages he sent to Al-Muqawqis, the ruler of Egypt, Heraclius, the Emperor of the Byzantine Empire, and Al-Najashi, the king of the Kingdom of Aksum, started with salutations and greetings. Then, they were asked to let their people hear the divine message that Prophet (PBUH & HP) had and decide freely whether they want to follow it or not. The reason behind sending letters to the heads of countries and tribes was that, if the leader of a group were convinced to change his\her mind and accepted Islam, then he\she would let his\her people hear the message of Islam and invite them more easily to Islam; like what happened with Al-Najashi. Hearing the Surat Maryam and realizing the truth, he let those Muslims who had moved from Mecca to Aksum to save their lives and settle down safely in his realm. This permission caused Islam to be spread readily in that land, and many people accepted Islam willingly.  

 This matches the principles of “peaceful coexistence” and “religious coexistence” that are encouraged in Islam [3]: “Say, ‘O People of the Book! Come to a common word between us and you: that we will worship no one but Allah, that we will not ascribe any partner to Him, and that some of us will not take some others as lords besides Allah.” (3:64).

Prophet Muhammad (PBUH & HP)'s  Attitude towards Non-Muslims

Prophet Muhammad (PBUH & HP) always encouraged Muslims to justice, fairness, respecting the rights, and avoiding harassment in dealing with the followers of other religions [2]. He said: “Whoever oppresses who is in agreement with Muslims and imposes a burden on him more than his tolerance, I will be against him on the judgment day.” [4] and “whoever offends who is under the protection of Islam, has offended me.” [4]. Those who were under the protection of Islam were the Jews and Christians who participated in providing the expenses of the Islamic government in return for being protected by paying money called “Jizya.” This shouldn’t be confused with paying for the right of life, but it means that the Jews and Christians were considered as common citizens who lived in a friendly ambiance with Muslims in the society, and no one was permitted to hurt them.

Moreover, Prophet Muhammad (PBUH & HP) cared about the living conditions of non-Muslims such that he ordered Muslims to give charity to the People of the Book (Jews, Christians, Sabians, and Zoroastrians) who were in need [5]. This was an act of humanity, and not a religious obligation, that originated from Prophet’s (PBUH & HP) exemplary character.

He respected non-Muslims such that once he was among his companions that people brought the corpse of a Jew. Prophet (PBUH & HP) stood up as a sign of respect. The companions told that the dead one was a Jew. He answered that one should stand up to respect the dead body, whether it belongs to a Muslim or a non-Muslim [6].

From what has been discussed above, one can see that Prophet Muhammad (PBUH & HP) has truly represented the peaceful essence of Islam through his words and acts. And actually, many of his enemies and non-Muslims embraced Islam due to his lovely noble character.

References:

1.  “Nahjul Balaqa,” Sermon 160.
2.  A. Ahmadi Miyanji, “Makatib al-Rasul,” p. 261-263.
3.  M. A. Amini, “The principle of peaceful coexistence with non-Muslims in Islam,” Ma’rifat Journal, no. 165, p. 35-52.
4.  S. Balaqi, “Justice and judgment in Islam,” p. 57.
5.  A. A. F. Thibarah, "Ruhuddin al-Islami," p. 276.
6.  Jafar Sobhani, “Introduction to principles of Islam,” p. 528-529,