Oh boy. Somebody's really trying to stir the shit now
I'm an Atheist myself-no middleman in my life. However I have read the bible(unlike many Christians) and would have to say yes, AS use is a sin. Since AS and recreational drugs were not available back then, I'd assume these 2 verses are the ones AS use would be categorized under.
"Everything is permissible for me" -- but not everything is beneficial. "Everything is permissible for me" -- but I will not be mastered by anything" (I Corinthians 6:12).
"Do not get drunk on wine, which leads to debauchery. Instead, be filled with the Spirit" (Ephesians 5:18).
Then again, this comes from a book that advocates torture, punitive amputation, slavery, oppression against women and handicapped people, violence, lawlessness, undermining of authority figures, murder of homosexuals and drunk teenagers, various human right's violations, etc...
Man, I'm gonna be in deep shit with the juiced up churchies now.