Is smoking weed a sin? Although the Bible does not address marijuana directly, it does discuss other mind-altering drugs. Specifically, the Bible addresses the use of drugs in the book of Galatians:

Now the deeds of the flesh are evident, which are: immorality, impurity, sensuality, idolatry, sorcery, enmities, strife, jealousy, outbursts of anger, disputes, dissensions, factions, envying, drunkenness, carousing, and things like these, of which I forewarn you, just as I have forewarned you, that those who practice such things will not inherit the kingdom of God. (Galatians 5:19-21)

So, where are the drugs mentioned in this verse? Actually, the word translated "sorcery" is the Greek word pharmakeia,4 from which we get the English word "pharmacy." The primary meaning is "the use or the administering of drugs" (usually associated with sorcery or idolatry). Since this verse comes from a list of things that, if practiced, would preclude one from heaven, this should be a reasonably strong suggestion that the Christian should not practice drug use. In addition, the book of Revelation lists drug use as one of the things for which the unrepentant will suffer the wrath of God.