Modern Era2018

The 2018 Farm Bill: Hemp Legalization & the CBD Explosion

How the 2018 Farm Bill legalized hemp, launched a multi-billion dollar CBD industry, and separated hemp from marijuana under federal law for the first time since 1937.

2018

Time Period

Historical era

Key Figures

Historical actors

Sections

In-depth coverage

FAQs

Common questions

Overview

The Agriculture Improvement Act of 2018, commonly known as the 2018 Farm Bill, removed hemp from the Controlled Substances Act's definition of marijuana, legalizing the cultivation, processing, and sale of hemp and hemp-derived products at the federal level for the first time in over 80 years. Hemp was defined as cannabis containing less than 0.3% THC by dry weight. The legislation triggered an explosion in the CBD (cannabidiol) market. CBD products — oils, tinctures, topicals, edibles, and beverages — flooded mainstream retail channels from pharmacies to gas stations. The CBD market grew from approximately $600 million in 2018 to an estimated $5 billion by 2021, with products appearing in major retailers including CVS, Walgreens, and Kroger. However, the Farm Bill also created regulatory confusion. The FDA maintained that CBD could not be legally added to food or marketed as a dietary supplement, yet enforcement was virtually nonexistent. Hemp-derived delta-8 THC products emerged as a controversial loophole, offering psychoactive effects through a technically legal pathway. The Farm Bill demonstrated both the potential of cannabis reform and the complications that arise when policy moves faster than regulation.

The 2018 Farm Bill built on the foundation of the 2014 Farm Bill, which had established a limited hemp pilot program allowing universities and state agriculture departments to grow hemp for research purposes. The 2014 program demonstrated that hemp could be cultivated successfully in the United States and built political support among agricultural states for full legalization. Senate Majority Leader Mitch McConnell, a Kentucky Republican, became hemp's most powerful congressional champion.

McConnell's support was driven by Kentucky's agricultural heritage. The state had been America's leading hemp producer before prohibition, and McConnell saw hemp legalization as an economic opportunity for Kentucky farmers. His backing gave the measure bipartisan credibility and ensured it survived the legislative process. The provision was included in the broader Farm Bill, which passed the Senate 87-13 and the House 369-47, before being signed by President Trump on December 20, 2018.

The legal distinction between hemp and marijuana hinged on a single number: 0.3% THC. Cannabis plants with THC concentrations at or below this threshold were classified as hemp and removed from the Controlled Substances Act. Plants exceeding 0.3% remained Schedule I marijuana. This arbitrary cutoff — originally proposed by Canadian researcher Ernest Small in a 1979 taxonomy paper, who himself noted it was not a meaningful pharmacological threshold — created ongoing complications for farmers whose crops occasionally tested above the limit.

The CBD market exploded following the Farm Bill's passage. Products derived from hemp-extracted CBD appeared in virtually every retail category: oils, capsules, gummies, topicals, pet products, beverages, and cosmetics. Major retailers began stocking CBD products, and consumer brands from Ben & Jerry's to Martha Stewart launched CBD lines. Market analysts estimated the CBD industry grew from $600 million in 2018 to $5 billion by 2021.

The FDA's approach to CBD created a regulatory vacuum. The agency maintained that CBD could not be legally added to food or marketed as a dietary supplement because it was an active ingredient in the FDA-approved drug Epidiolex. However, the FDA took virtually no enforcement action against the thousands of companies selling CBD products, creating a gray market where products were technically illegal but widely available. Many CBD products were found to contain inaccurate potency labels, contaminants, or no CBD at all.

Perhaps the most controversial consequence of the Farm Bill was the emergence of hemp-derived delta-8 THC. Manufacturers discovered they could convert CBD, which is abundant in hemp, into delta-8 THC through a chemical process. Because delta-8 THC derived from legal hemp was arguably not covered by the Controlled Substances Act, products offering psychoactive effects began appearing in states where marijuana remained illegal. This loophole prompted calls for regulatory clarity and became a contentious issue in subsequent Farm Bill discussions.

Key Figures

Mitch McConnell

Senate Majority Leader who championed hemp legalization

Jonathan Miller

former Kentucky Treasurer and U.S. Hemp Roundtable president

Ernest Small

Canadian researcher whose 0.3% THC threshold became the legal standard

Charlotte Figi

child whose epilepsy treatment with CBD oil inspired Charlotte's Web legislation

Historical Significance

The 2018 Farm Bill federally legalized hemp for the first time since 1937, launching a multi-billion dollar CBD market and creating the legal framework that separated hemp from marijuana under federal law.

Frequently Asked Questions

What did the 2018 Farm Bill do for hemp?

The 2018 Farm Bill removed hemp (cannabis with less than 0.3% THC) from the Controlled Substances Act, legalizing its cultivation, processing, and sale at the federal level. It was the first time hemp had been federally legal since the Marihuana Tax Act of 1937.

Is CBD legal under the Farm Bill?

Hemp-derived CBD is legal under the Farm Bill, but the FDA maintains it cannot be legally added to food or marketed as a dietary supplement. In practice, CBD products are widely available with minimal enforcement. The regulatory status remains unresolved.

What is the difference between hemp and marijuana?

Under the Farm Bill, the legal distinction is the THC content. Hemp is cannabis with 0.3% THC or less by dry weight. Cannabis exceeding 0.3% THC is classified as marijuana and remains a Schedule I controlled substance. Biologically, hemp and marijuana are the same plant species.

What is delta-8 THC and is it legal?

Delta-8 THC is a psychoactive cannabinoid that can be synthesized from hemp-derived CBD. Because it comes from legal hemp, its legality is disputed. Many states have moved to ban or regulate delta-8, and the issue is expected to be addressed in future Farm Bill legislation.