What Does the Bible Say About Marijuana?

While there aren't specific verses about weed in the Bible many believe recreational use is still a sin. The Bible warns us against substances that compromise judgement (Eph. 5:18) and says God wants us to keep a sober mind (1 Peter 5:8). Any items that could take us away from God should be avoided whenever possible. (Romans 12:2) What do you think about recreational marijuana?