Steele, Allen. "Green Acres"
Divergence: 1937 CE
What if: The Marijuana Tax Act of 1937 was voted down by Congress, and during World War II industrial hemp became the biggest cash crop in America.
Summary: The effects of smoking marijuana remain virtually unknown until the 1970s, and attempts to ban it lead to economic turmoil.
Published: In Science Fiction Age, March 1999.