In 1937, when Harry Anslinger ran the Marijuana Tax Act through Congress, the standard historical explanation is racism and bureaucratic empire-building. Both are real factors. But there’s a parallel economic timeline that gets less attention, and it runs directly through the petrochemical industry.
That same year, Popular Mechanics published an article titled “New Billion-Dollar Crop” describing hemp as a potential source for more than 25,000 products, from cellophane to dynamite.
DuPont had just patented nylon and was in the process of patenting synthetic resins derived from petroleum. William Randolph Hearst, whose newspaper empire ran the “reefer madness” coverage that made Anslinger’s campaign possible, held enormous timber interests threatened by hemp’s superior economics as a paper fiber source.
The Mellon family, whose investment bank held DuPont accounts, had placed Andrew Mellon in Treasuryâthe department that supervised Anslinger’s bureau.
None of this proves a coordinated conspiracy. But it maps a set of financial interests that had concrete, measurable reasons to want industrial hemp eliminated from competition. Those interests got what they wanted.
Hemp cultivation in the United States effectively ended with the 1937 act, was briefly resurrected during World War II under the “Hemp for Victory” program when Japanese naval blockades cut off Philippine imports of Manila rope fiber, and then ended again in 1957.
The petrochemical industry that grew in hemp’s absence now generates revenues in the tens of trillions annually across its downstream product chainsâplastics, synthetic fibers, lubricants, paints, solvents, packaging, insulation, construction materials.
The hemp alternative for most of those product categories has existed, dormant, since at least the early 20th century. The figure commonly citedâ50,000 potential products from hempâoriginates in various agricultural research reports and has been repeated by sources ranging from the USDA to hemp industry advocacy organizations. The precise number is less important than what it represents: hemp as a platform crop, not a single commodity.
Industrial hemp produces four primary feedstocks: fiber (from the bast and hurd of the stalk), seed (for oil and protein), cannabinoids (from the flower), and roots (with limited pharmaceutical applications). Each feedstock competes directly with petroleum-derived alternatives in multiple product categories.
Hemp fiber replaces synthetic fibers in textiles, rope, and geotextiles.
The European Union never banned industrial hemp cultivation the way the United States did, and by 2024 European hemp fiber production had grown to supply automotive insulation, construction materials, and textile blending applications. BMW and Mercedes-Benz have used hemp fiber composites in door panels for over a decadeâit’s lighter than fiberglass, biodegradable, and has comparable tensile strength. (This is documented in multiple automotive industry lifecycle analyses; the German technical standards body has certified hemp fiber composites for various automotive applications.)
Hemp seed oil competes with petroleum-derived lubricants, certain paint vehicles, and is directly comparable to linseed oil in drying oil applications. Hemp seed protein competes with soy in food applicationsâand soy’s dominance in American agriculture is itself a product of mid-century agricultural policy decisions that didn’t have to go the way they went.
The most economically significant application may be hempcreteâa composite of hemp hurd (the woody core of the stalk) with lime binder and water that produces a building material with properties that challenge both conventional concrete and synthetic insulation. Hempcrete is carbon-negative over its life cycle, because the hemp plant sequesters CO2 during growth, and that carbon remains fixed in the cured building material. The construction sector accounts for roughly 11 percent of global carbon emissions from materials manufacturing alone, according to the Global Alliance for Buildings and Construction. Hempcrete doesn’t solve all of that, but it addresses the insulation and non-structural wall category, which is not a small share.
The regulatory barrier to hempcrete adoption in the United States is not technical. It’s classificatory. Building codes are controlled at the municipal and state level, and codes lag material innovation by decades. Hempcrete has been used in European construction since the 1990sâFrench buildings using hemp-lime walls from that era remain standing and have been studied extensively. American code adoption has been slow, though some states have made progress. The impediment is not engineering data. It is the institutional inertia of industries whose product lines codes currently mandate.
Hemp as a bioplastics feedstock is perhaps the longest-range competitive threat to the petrochemical status quo.
Current bioplastics are dominated by PLA (polylactic acid) derived from corn starch, which has its own agricultural efficiency problems. Hemp cellulose provides a higher-yield feedstock for biocomposite plastics with better tensile properties than corn-derived alternatives. The technology is not speculative; it’s at early commercial scale in several European and Canadian operations. What it is not is cheap at current production volumes, because the American hemp agricultural supply chainâdestroyed in 1937 and only partially rebuilt since the 2018 Farm Billâdoesn’t yet produce the raw material volume that would make processing economics work.
This is the structure of the suppression: not a conspiracy that must be actively maintained, but a set of path dependencies built into infrastructure, regulation, capital allocation, and supply chain development that perpetuate petroleum dominance passively. You don’t need Rockefeller’s ghost writing memos. You need building codes that haven’t been updated since 1970, agricultural extension programs that don’t teach hemp agronomy, processing infrastructure that doesn’t exist, and capital markets that fund what they already understand.
The 2018 Farm Bill’s hemp legalization was a genuine opening, and it has produced real agricultural development, particularly in the CBD and hemp-derived cannabinoid sectors. But it has not produced a hemp industrial renaissance, because the cannabinoid market absorbed most of the early investment and cultivation interest. The fiber and hurd processing infrastructureâthe part that competes with petrochemicalsâremains underdeveloped. There are perhaps a dozen operating decortication facilities in the United States capable of processing hemp bast fiber at commercial scale. Compare that to the hundreds of facilities that exist for cotton ginning, corn wet milling, or soybean crushing.
Every purchase of a hemp-fiber textile, hemp building material, or hemp seed oil product puts capital into a supply chain that petroleum dependency needs to remain small. Every farm that adds hemp rotation builds the agricultural base that processors need to justify infrastructure investment. The leverage points are real and they are not primarily political, because the political system that would need to clear the regulatory path is substantially funded by the industries hemp competes with.
The petrochemical lobby spent $65 million on federal lobbying in 2023 alone, according to OpenSecrets data. The hemp industry spent roughly $3 million. That disparity doesn’t change at the ballot box; it changes when hemp-derived products achieve enough market penetration that the cost of suppression exceeds the benefit.
We are not close to that threshold. But the trajectory is real, and it starts with the individual choice to use hemp where petroleum alternatives currently dominate. This is not idealism. It is supply chain engineering from the demand side.
The war between hemp and oil was never really about a plant. It was about who controls the material substrate of industrial civilization. That question is not settled. It is still being answered, one product purchase, one farm decision, one building material specification at a time.
The hegemony at stake is enormous. The wedge is small enough to hold in your hand.
HEMP OR CANNABIS OIL? READ ON…
