Praise be to Allah (The Glorified and Exalted).
Pass the following hadith to your friend. The one who purposely drinks intoxicants may face the following punishment:
Jabir reported:
Allah’s Messenger (peace and blessings be upon him) said, “Every intoxicant is forbidden. Verily Allah the Exalted and Majestic, made a covenant to those who drank intoxicants to make their drink Tinat al-Khabal.” They said, ‘Allah’s Messenger, what is Tinat al-Khabal?’ He said, “It is the sweat of the denizens of Hell or the discharge [pus from the wounds] of the denizens of Hell.” [Muslim: Book 23: Hadith 4962]
‘Abd-Allah ibn ‘Amr said:
The Messenger of Allah (peace and blessings of Allah be upon him) said, “Whoever drinks alcohol and gets drunk, his prayers will not be accepted for forty days, and if he dies he will go to Hell, but if he repents, Allah will accept his repentance. If he drinks wine again and gets drunk, his prayer will not be accepted for forty days, and if he dies he will go to Hell, but if he repents, Allah will accept his repentance. If he drinks wine again and gets drunk, his prayer will not be accepted for forty days, and if he dies he will go to Hell, but if he repents, Allah will accept his repentance. If he does that again, Allah will give him to drink of the mud of Khabal on the Day of Resurrection.” They said, “O Messenger of Allah, what is the mud of Khabal?” He said, “The juice [i.e. the pus from their wounds] of the people of Hell.” [Ibn Majah no. 3377; classed as saheeh by al-Albaani in Saheeh Ibn Majah, 2722]
And there is another hadith mentioning that some people will come on the Day of Judgment with good deeds on their records like the heights of mountains, however, all of their goods deeds will be turned into dust because they used to cross the Sacred Limits established by Allah (The Exalted) while in privacy.
And Allah Knows Best.