As one who spent 10 years in a drug and alcohol state of mind, of which the God of the Bible delivered me and set me free, and now a minister of the gospel having studied the word of God diligently, I'm very familiar about what I speak.
“Altering the thought process with mind altering substances for the sole purpose of a euphoric feeling is a sin”
Is that not choice of free will? To do or not is between one and God, not one and the State.