يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِنَّمَا ٱلْخَمْرُ وَٱلْمَيْسِرُ وَٱلْأَنصَابُ وَٱلْأَزْلَٰمُ رِجْسٌۭ مِّنْ عَمَلِ ٱلشَّيْطَٰنِ فَٱجْتَنِبُوهُ لَعَلَّكُمْ تُفْلِحُونَ ﴿٩٠﴾
信道的人们啊! 饮酒、赌博、拜像、求签，只是一种秽行，只是恶魔的行为，故当远离，以便你们成功。
Haram Food & drink
Are drugs and other intoxicants haram?
Short answer
Yes. Substances that intoxicate or cloud the mind, such as narcotics, fall under the ruling of khamr because they share its reason: they take away the mind and cause harm. The Quran also warns against destroying oneself (4:29).
Evidence
Quran
يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ لَا تَأْكُلُوٓا۟ أَمْوَٰلَكُم بَيْنَكُم بِٱلْبَٰطِلِ إِلَّآ أَن تَكُونَ تِجَٰرَةً عَن تَرَاضٍۢ مِّنكُمْ ۚ وَلَا تَقْتُلُوٓا۟ أَنفُسَكُمْ ۚ إِنَّ ٱللَّهَ كَانَ بِكُمْ رَحِيمًۭا ﴿٢٩﴾
信道的人们啊！你们不要借诈术而侵蚀别人的财产，惟借双方同意的交易而获得的除外。你们不要自杀，真主确是怜恤你们的。
Hadith
Sahih Muslim 2003a
Ibn 'Umar reported Allah's Messenger (ﷺ) as saying:Every intoxicant is Khamr and every intoxicant is forbidden. He who drinks wine in this world and dies while he is addicted to it, not having repented, will not be given a drink in the Hereafter
Arabic text (with chain of narrators)
حَدَّثَنَا أَبُو الرَّبِيعِ الْعَتَكِيُّ، وَأَبُو كَامِلٍ قَالاَ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، حَدَّثَنَا أَيُّوبُ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " كُلُّ مُسْكِرٍ خَمْرٌ وَكُلُّ مُسْكِرٍ حَرَامٌ وَمَنْ شَرِبَ الْخَمْرَ فِي الدُّنْيَا فَمَاتَ وَهُوَ يُدْمِنُهَا لَمْ يَتُبْ لَمْ يَشْرَبْهَا فِي الآخِرَةِ " .
Sunan Abi Dawud 3681 Grade: Al-Albani: Hasan Sahih · Muhammad Muhyi Al-Din Abdul Hamid: Hasan Sahih · Shuaib Al Arnaut: Sahih Lighairihi · Zubair Ali Zai: Isnaad Hasan
Narrated Jabir ibn Abdullah: The Prophet (ﷺ) said: If a large amount of anything causes intoxication, a small amount of it is prohibited
Arabic text (with chain of narrators)
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا إِسْمَاعِيلُ، - يَعْنِي ابْنَ جَعْفَرٍ - عَنْ دَاوُدَ بْنِ بَكْرِ بْنِ أَبِي الْفُرَاتِ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَا أَسْكَرَ كَثِيرُهُ فَقَلِيلُهُ حَرَامٌ " .
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Are drugs and other intoxicants haram?
Yes. Substances that intoxicate or cloud the mind, such as narcotics, fall under the ruling of khamr because they share its reason: they take away the mind and cause harm. The Quran also warns against destroying oneself (4:29).