The concept of responsibility in Islam covers all the aspects of human beings and considers different situations one may encounter in his/her life. Islam is not only a religion but also a life plan; a divine plan that addresses all the humans throughout the history of humankind. Since religion, as a plan deals with the daily life of humans, it has illustrated the tasks and responsibilities in Islam of humans.

These duties can be summarized in four items: 

The rights that God has over humans;

The rights that one has over himself;

The responsibilities towards other humans;

And, the responsibilities towards other creatures in this world.

These four categories will be discussed under separate topics each considering one responsibility in Islam. Here the focus is on the humans’ responsibility in Islam towards God.

The Most Important Right of Allah over Humans and Their Responsibility in Islam

According to Imam Sajjad (AS), the rights that God has over human beings, which are the most important rights over everybody, are to know that we are His servants, to pray Him and not ascribe any partners to Him [1]. This means that we have two main responsibilities in Islam towards God: first, to recognize and believe in God then, practically demonstrate it. 

To recognize God and to believe in Him

The first thing is to accept the existence of the one true God and to recognize all his divine attributes such as very powerful (Qadir), the provider (Razzaq), generous (Karim), etc.

By knowing these attributes and then believing that they are unique to God, one will be more successful in his duties responsibilities in Islam towards God [i]. For example, knowing that God is the only provider (Razzaq) in the universe, a true Muslim does not worry about livelihood, nor he\she will be greedy for more wealth. He\she knows that if he\she works adequately according to his\her capacities, he\she will be provided with the sustenance that God has reserved for him\her. 
Imam Ali (AS) has advised his son Imam Hassan (AS) to recognize God since it is a duty over every human being: “He is One Allah whom we should all recognize and worship” [2].

Then, Imam (AS) enumerates some of the attributes of God that a Muslim should believe in [2]:

“Nobody is a partner to Him in His Domain”;
 “He is Eternal, has always been and shall always be”; 
“He existed even before the Universe came into being, but there is no beginning to His Existence”; 
“He shall remain when every other thing shall vanish, and there shall be no end to His Existence”; 
“His Glory and His Existence is so supreme, pre-eminent, transcendent, incomparable and excellent that it is beyond the grasp of intellects”; 
“No one can understand or visualize Him.“ [2].

To Verbally Admit to the Unity of God as a Responsibility in Islam  

To recognize God and to believe in Him deeply in the heart are not enough; one should also say that he\she believes in God; otherwise, no one will be aware of his\her belief if it is not declared. That is why one should pronounce two testimonies (Shahadatain) to become Muslim.

In Surah Fatir, it is said that “To Him ascends good speech” (35:10), which means that the verbal admission to God is appreciated and is surely beneficial. But, it should be accompanied with good deeds and obedience to God to be more valuable: “and righteous work raises it.” (35:10). 

To Worship God and to Obey his Commands

Indeed, demonstrating the belief in God in practice is as important as believing in Him. If a child loves his\her parents but ignores their expectations and advice, he\she, in fact, does not respect them and the parents will not believe the his\her claim of having affection for them.

The same happens between a Muslim and God. A Muslim who ignores God’s commands, which are beneficial to him\her, does not truly believe in Him. Otherwise, he\she knew that everything that God has ordered to is to help him\her to live a better life, to improve and to reach the perfection that he\she merits.

According to Imam Ali (AS) [2], after accepting the facts mentioned above about God, a Muslim’s behavior should be like that of a person who realizes God’s superior status and power. He\she should try to gain His blessing through prayers and obedience, fear His wrath as well as His Punishments and feel him\herself absolutely in need of His help and protection [2]. 

In the Quran, it is stated that humans are created to worship God  (51:56). Prayer and worship of God are duties over every Muslim as they remind him\her of the his\her creator and the fact that there is a reason to be in this world. 

Another practical duty is to obey God’s commands that are mentioned in the Quran or explained in the narrations from prophet Muhammad (PBUH&HP) and Imams (AS). Simply said: to do what is obligatory (Wajib) or advised to (talk pleasantly to others (2:83); to do good to others (16:90); to fast (2:183) and pray (4:103); etc.) and to leave what is Forbidden (Haram) (talking behind back of others (49:12); wasting water and nutrition (7:31))2.

Briefly, there are three main duties over every Muslim about God: to recognize Him, to declare the admission to Him, and to obey and worship Him. Duties of a Muslim towards him\herself and his responsibility in Islam, other people, and other creatures will be discussed in the next parts of the article.

Notes:
[i] Recognition and belief are two different concepts. The recognition of God means to accept His existence and all His divine attributes, while the belief in God means to have faith in Him. 

[ii] The two other categories of acts according to Islamic jurisprudence are: Recommended (Mustahab) acts and Detestable or abominable (Makruh) acts. Recommended (Mustahab) acts are those practices which are not compulsory in Islam, but a believer prefers to do it for God’s satisfaction. Detestable or abominable (Makruh) actions are not subject to punishment, but a believer abstains from them for God’s satisfaction.

References:

1. Imam Sajjad (AS), Treatise On Rights (Risalat al-Huquq).
2. Nahj al balagha, Letter 31.
    

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.