It's true that sprituality comes first but to achieve that state of sprituality you need a discipline.
Let's say I am trying to build a Muscular body then I must have a diet plan,I can't just say that I'll build my body first & the day I have done that that day I'll make a diet plan till then I'll eat whatever I like.Similarly you must have the discipline first only then you can achieve that sprituality.In the influence of Drugs & alcohol you have no control over you consciousness & to get to that spiritual level you need full focus & consciousness of the mind.Guru ji talks about it in gurbani:
ਅਮਲ ਗਲੋਲਾ ਕੂੜ ਕਾ ਦਿਤਾ ਦੇਵਣਹਾਰਿ ॥
Amal galolĝ kūṛ kĝ ḝiṯĝ ḝėvaṇhĝr.
The Great Giver has given the intoxicating drug of falsehood.
ਮਤੀ ਮਰਣ ਵਿਸਾਰਿਆ ਖਸੀ ਕੀਤੀ ਦਿਨ ਚਾਰਿ ॥
Maṯī maraṇ visĝriĝ kẖusī kīṯī ḝin cẖĝr.
The people are intoxicated; they have forgotten death, and they have fun for a few days.
ਸਚ ਮਿਲਿਆ ਤਿਨ ਸੋਫੀਆ ਰਾਖਣ ਕਉ ਦਰਵਾਰ ॥੧॥
Sacẖ miliĝ ṯin sofīĝ rĝkẖaṇ kao ḝarvĝr. ॥1॥
Those who do not use intoxicants are true; they dwell in the Court of the Lord. ॥1॥(SGGS p15)
ਕਬੀਰ ਭਾਂਗ ਮਾਛਲੀ ਸਰਾ ਪਾਨਿ ਜੋ ਜੋ ਪਰਾਨੀ ਖਾਂਹਿ ॥
kabeer bhaaNg maachhulee suraa paan jo jo paraanee khaaNhi.
Kabeer, those mortals who consume marijuana, fish and wine
ਤੀਰਥ ਬਰਤ ਨੇਮ ਕੀਝ ਤੇ ਸਭੈ ਰਸਾਤਲਿ ਜਾਂਹਿ ॥੨੩੩॥
tirath barat naym kee-ay tay sabhai rasaatal jaaNhi. ॥233॥
- no matter what pilgrimages, fasts and rituals they follow, they will all go to hell. ॥233॥(SGGS p1377).
