Because cigarettes are clearly harmful to health, even smokers themselves admit that cigarettes harm their health
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It's just the cigarette addiction is so strong make them hard to escape from smoking
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Because cigarettes are harmful to the body, it is clear that the law is haram in Islam is not makruh as most smokers presume
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From Ibn 'Abbas, Rasulullah ﷺ said, No (may do / use something that) dangerous or dangerous. (Narrated by Ibn Majah 2340)
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Allah ﷻ says: And do not throw yourself into destruction. (Surat al-Baqarah: 195)
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And do not kill yourself; verily Allah is Most Merciful to you. (Surah An Nisaa: 29)
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And smoking includes the waste of treasures, the Messenger ﷺ said: Allah hates three things upon you: wasted talk, waste of treasures, much asking. (Muttafaq 'alaih)
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Sentence in the afterlife
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That is they will be threatened into hell, they are constantly sucking the poison in hell jahanman and it is a torment for them
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From Abu Hurairah, the Prophet ﷺ said: Whoever deliberately threw himself from the mountain to death, then he is in hell hell in a state of throwing in the hell, eternal forever
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Whoever deliberately inhaling / poisoning to death then the poison is still in his hands and he breathed it / drank it in hell Jahannam in eternal state for ever
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And whoever kills himself with iron, then the iron will be in his hand and he thrust into his stomach in hell Jahannam in an eternal state for ever. (Bukhari no 5778)
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From Thabit bin Dhahhak, the Prophet ﷺ said: Who kills himself in a certain way in the world then he will be tortured on the Day of Judgment in the same way. (HR Ahmad 16041)