Legalization has nothing to do with sin. By your premise it should be illegal to lie and not go to church on Sunday.
abortion is legal -— however, it remains a sin in the eyes of God.
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.