“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.
Yup, you have a free-will. You can even rob, steal, kill, nad destroy if you choose to do so. You can drink drano should you choose to do so. Be reminded also that God ordained government with a purpose. Man is free to choose what he wills, but he will suffer the consequences of sinful behavior (in this world, and the world to come).