I heard a preacher say one time that drugs and alcohol is used by people who do not have the Holy Spirit in their life....the euphoria they get is like a replacement for the "high" one experiences when in His presence.
Now I am not saying this is accurate but I can say when I am walking with Him I don't want the other stuff....when I had backslidden in the past I wanted to drink.
In any case, the question is....
WHY are you drinking?
That is not the question: the question is drinking being a sin or not.
And being on topic:
It is good neither to eat flesh, nor to drink wine, nor any thing whereby thy brother stumbleth, or is offended, or is made weak. (Rom 14)
Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days. (Col 2)
These two Scripture alone establish plainly that drinking wine is as eating meat, and neither is sin with God, which no man is to judge another in by making a law against it.
Another matter entirely is the weaker and the stronger continuing in brotherly love:
Let not him that eateth despise him that eateth not; and let not him which eateth not judge him that eateth: for God hath received him. (Rom 14)
Neither eating nor drinking is sin in itself. That is a settled matter with God.
And so, your question again: Why do I drink?
Why not? I obviously am not you. Before I was saved, I was a drunkard and chain smoker. Now I drink and smoke at will, if I want to, and I know how to not drink and smoke, if I don't want to, or if I choose not to due to present company and circumstance.
'Strong' Christianity is not the weak challenging nor demanding others to be the same as they. Strong Christianity is being able to partake of all things richly to enjoy, and to have power over all things, rather than they having power over us by lust corrupting and destroying all things:
All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any. (1 Cor 6)
Charge them that are rich in this world, that they be not highminded, nor trust in uncertain riches, but in the living God, who giveth us richly all things to enjoy. (1 Tim 6)
Now a question for you:
Did you blame the drink or the lust during your return to sin?