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H 191

An Act relative to limiting the potency of THC products

194th Legislature (2025-2026) Introduced by John Keenan and 1 co-sponsor

Bill H 191 caps THC potency in Massachusetts cannabis products to address public health concerns around addiction and mental health effects.

Accompanied a study order, see H5396 (under House Rule 27)
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Bill Summary · H 191

Legislative bill overview

H 191 proposes to establish limits on the potency of tetrahydrocannabinol (THC) in cannabis products sold in Massachusetts. The bill would cap the maximum allowable THC concentration in various cannabis products, likely including flower, concentrates, and edibles. This represents a regulatory constraint on the legal cannabis market that Massachusetts has permitted since 2016.

Why is this important

THC potency in cannabis products has increased significantly over the past decade, with some concentrates exceeding 90% THC. Potency limits directly affect consumer access, product pricing, tax revenue, and public health outcomes—particularly regarding cannabis use disorder, impaired driving risks, and mental health effects in vulnerable populations. The bill could reshape Massachusetts' competitive cannabis market and its estimated $2+ billion annual industry.

Potential points of contention

  • Industry impact: Cannabis producers and retailers argue potency caps reduce product variety, competitiveness, and tax revenue, potentially driving consumers to illicit markets or neighboring states
  • Consumer choice vs. public health: Supporters cite mental health and addiction risks from high-potency products; opponents counter that adults should have market access and that heavy users will simply consume more product
  • Enforcement and definitions: Unclear how potency limits apply across different product types (flower vs. edibles vs. concentrates) and how existing inventory would be handled during implementation

Compiled from official sources — confirm details with the bill’s official record.

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