Nationally, the potency of marijuana has more than tripled since the mid-1990s.

  Average potency of marijuana flowers/buds in Colorado is now 17.1% THC while the average potency for concentrates is 62.1%. Potency rates of up to 95% have been recorded.
  After the Dutch observed negative impacts from rising THC potencies, a team of health experts concluded that THC potencies above 15% should be considered a hard drug.
  Colorado ranks 1st in the nation for youth (12+) use of marijuana.
  Research shows marijuana is harmful to the developing brains of adolescents, which may result in psychotic symptoms, schizophrenia, drug addiction and lower IQs.

The rise of high-potency pot has coincided with increases in Colorado hospitalizations and poison center calls.

  More potent pot has been tied to psychotic episodes.
A well-known British study has linked higher potency pot (12%-18%) to 24% increase in new cases of psychosis.
Tolerable doses of marijuana have yet to be determined even though highly potent pot is already being sold on Colorado’s commercial market.

Limit THC potencies until there is scientific evidence to prove highly potent pot does not pose unacceptable risks to public.

Educate the public – especially youth – on dangers of marijuana and well-studied and documented negative impacts to the developing brain of lower-potency pot.
Fund research to better understand the risks associated with such high concentrations of THC.
Limit marijuana commercialization, advertising and marketing, which normalizes and promotes use among youth.
Enforce laws restricting false health and benefit claims.

Unrelenting Vomiting

Paranoia Increased
Heart Rate Dangerous
Panic Attacks
Extended Psychosis
Difficulty Breathing

Call 911 for any medical emergency

Call 311 to report marijuana complaints and violations in Denver
Concerning reactions, call Rocky Mountain Poison & Drug Center 1-800-222-1222
To anonymously report anything that concerns or threatens you, your friends, your family or community, call Safe2 Tell 1-877-542-7233 (
Colorado Department of Public Health and the Environment 
National Institute on Drug Abuse for Teens
National Institute on Drug Abuse 

Download the #KnowPotency handout.

*Our handout includes all sources for facts mentioned above.

THC Potency in the News


Halloween Marijuana Edibles Warning

Unfortunately in Colorado children and teenagers (and even adults) don’t have any way of knowing if marijuana is in their candy, food, or drinks. Please read the warning put out by the Denver police and watch the video where Patrick Johnson, owner of


Increasing THC Levels on the Developing Brain

Increasing marijuana THC levels is having a stronger impact on the developing brain, something important for Colorado teens and those who care about them to be aware of as marijuana becomes increasingly commercialized in Colorado and currently there are n


Most Powerful Pot in the World

Colorado pot is viewed as the most “powerful” (potent pot) in the world by sheriffs from 11 surrounding areas. The article below highlights how Amsterdam is treating pot with THC levels over 15% as a hard drug while there are no THC content limits on


Reports on Increasing THC Levels

PBS reports on how THC potency of marijuana has dramatically increased. We already know lower levels of THC can permanently impact the developing brain. Unfortunately, there hasn’t been any research conducted on what the additional health impacts will b