--- title: "Shocking Insights: Cannabis & Performance by Dr. Parsley" description: Discover why Dr. Parsley argues that cannabis is a neurological liability and not a performance enhancer for athletes. image: https://420intel.com/hubfs/AI-Generated%20Media/Images/The%20image%20features%20Dr%20Kirk%20Parsley%20a%20ruggedly%20built%20man%20in%20his%20late%2040s%20sitting%20in%20a%20modern%20studio%20adorned%20with%20fitness%20equipment%20and%20books%20on%20health%20He%20has%20shortcropped%20hair%20and%20a%20serious%20expression%20as%20he%20leans%20slightly%20forward%20engaging%20in%20an%20animat.jpeg --- [![420intel.com](https://420intel.com/hs-fs/hubfs/Asset%2016-1.png?width=300&height=162&name=Asset%2016-1.png "420intel.com")](https://420intel.com) - [Home](https://420intel.com) - [Advertise](https://420intel.com/advertise) - [Directory](https://420intel.com/directory) - [Topics](https://420intel.com/blog) - [Recreational News](https://420intel.com/blog/tag/recreational-cannabis-news) - [Business News](https://420intel.com/tag/cannabis-business-news) - [Politics](https://420intel.com/tag/cannabis-politics) - [Technology](https://420intel.com/tag/cannabis-technology-news) - [Research](https://420intel.com/tag/medical-cannabis-news) - [Contact](https://420intel.com/contact-us) - [Follow us on Facebook](https://www.facebook.com/420intel) - [Follow us on LinkedIn](https://www.linkedin.com/company/420-intel/) - [Follow us on Twitter](https://x.com/420intel) - [Follow us on Instagram](https://www.instagram.com/420intel) ### Press ESC to close [![420intel.com](https://420intel.com/hs-fs/hubfs/Asset%2016-1.png?width=300&height=162&name=Asset%2016-1.png "420intel.com")](https://420intel.com) - [Home](https://420intel.com) - [Advertise](https://420intel.com/advertise) - [Directory](https://420intel.com/directory) - [Topics](https://420intel.com/blog) - [Recreational News](https://420intel.com/blog/tag/recreational-cannabis-news) - [Business News](https://420intel.com/tag/cannabis-business-news) - [Politics](https://420intel.com/tag/cannabis-politics) - [Technology](https://420intel.com/tag/cannabis-technology-news) - [Research](https://420intel.com/tag/medical-cannabis-news) - [Contact](https://420intel.com/contact-us) - [Follow us on Facebook](https://www.facebook.com/420intel) - [Follow us on LinkedIn](https://www.linkedin.com/company/420-intel/) - [Follow us on Twitter](https://x.com/420intel) - [Follow us on Instagram](https://www.instagram.com/420intel) # Shocking Insights: Cannabis & Performance by Dr. Parsley - [![Buzz](https://420intel.com/hs-fs/hubfs/Buzz-No%20Outline-2.png?width=80&height=80&name=Buzz-No%20Outline-2.png) Buzz](https://420intel.com/blog/author/buzz) - [Medical Cannabis News](https://420intel.com/blog/tag/medical-cannabis-news) - 21 July 2025 Cannabis is not a performance enhancer – it’s a neurological liability. Dr. Kirk Parsley breaks down how chronic use reduces blood flow to the brain and impairs cognitive function. Learn why athletes need to think twice before calling weed a recovery tool.   I had the chance to sit down with Dr. Parsley – a former Navy SEAL and sleep expert – for a no-BS conversation about cannabis and athletic performance. As someone who’s constantly looking to separate hype from hard science, I asked him point-blank: Can cannabis be a performance enhancer?   Dr. Parsley went deep on what cannabis, especially when inhaled, does to the brain. He explained that inhaling marijuana chronically decreases blood flow to the brain, not just in the moment, but for days or even weeks after use. You could quit for a week and still be walking around with suboptimal blood flow upstairs. That’s not something you want if performance, recovery, or even basic cognitive function matters to you. We’re not talking about a temporary side effect. According to Dr. Parsley, the impact on vascular patency – how open and functional your blood vessels are – can be long-lasting. And as if that weren’t enough, there’s growing concern about toxins in cannabis, especially from pesticides. With the industry being largely unregulated in many areas, more and more cannabis products are testing positive for harmful pesticides. Athletes looking for recovery hacks might not realize they’re inhaling or ingesting neurotoxins along with their THC. There’s a growing narrative out there that cannabis is a wonder drug for recovery, pain, and sleep. But what we’re not hearing enough about is what it costs in terms of brain health, vascular function, and actual performance outcomes. As someone who’s spent a lifetime around elite athletes, I can tell you this: nothing that compromises blood flow to the brain is helping you perform better. If you’re serious about optimizing your body and mind, you need to rethink long-term cannabis use. Catch the whole conversation with Dr. Parsley on Power Athlete Radio Ep. 547 for more truth about performance, recovery, and what works.   [by](https://www.si.com/everyday-athlete/mentorship/the-truth-about-cannabis-and-performance-dr-kirk-parsley-drops-a-reality-check)[Sports Illustrated](https://www.si.com/everyday-athlete/mentorship/the-truth-about-cannabis-and-performance-dr-kirk-parsley-drops-a-reality-check) [Medical Cannabis News](https://420intel.com/blog/tag/medical-cannabis-news) [Medical Marijuana News](https://420intel.com/blog/tag/medical-marijuana-news) ![Buzz](https://420intel.com/hs-fs/hubfs/Buzz-No%20Outline-2.png?width=200&height=200&name=Buzz-No%20Outline-2.png) #### [Buzz](https://420intel.com/blog/author/buzz) At 420 Intel, we cover cannabis legalization news throughout the world, offer reliable information for cannabis business owners, detail technological advances that impact the marijuana industry, cover marijuana rallies from across the globe, and everything in between. - - - [Cannabis Politics](https://420intel.com/blog/tag/cannabis-politics) [![Voters Reject Marijuana Legalization in North Dakota and South Dakota](https://420intel.com/hs-fs/hubfs/AI-Generated%20Media/Images/no%20cannabis.jpeg?width=550&height=395&name=no%20cannabis.jpeg)](https://420intel.com/blog/voters-reject-marijuana-legalization-in-north-dakota-and-south-dakota) - [![Buzz](https://420intel.com/hs-fs/hubfs/Buzz-No%20Outline-2.png?width=80&height=80&name=Buzz-No%20Outline-2.png) Buzz](https://420intel.com/blog/author/buzz) - 6 November 2024 #### [Voters Reject Marijuana Legalization in North Dakota and South Dakota](https://420intel.com/blog/voters-reject-marijuana-legalization-in-north-dakota-and-south-dakota) Voters in two sparsely populated red states, North Dakota and South Dakota, have rejected ballot... [Cannabis Business News](https://420intel.com/blog/tag/cannabis-business-news) [![Cannabis Use Is Rising Across The US – Except in One Key Group](https://420intel.com/hs-fs/hubfs/Imported_Blog_Media/Cannabis%20Use%20Is%20Rising%20Across%20The%20US%20%E2%80%93%20Except%20in%20One%20Key%20Group.jpg?width=550&height=395&name=Cannabis%20Use%20Is%20Rising%20Across%20The%20US%20%E2%80%93%20Except%20in%20One%20Key%20Group.jpg)](https://420intel.com/blog/cannabis-use-rising-across-us-except-one-key-group) - [![Buzz](https://420intel.com/hs-fs/hubfs/Buzz-No%20Outline-2.png?width=80&height=80&name=Buzz-No%20Outline-2.png) Buzz](https://420intel.com/blog/author/buzz) - 12 September 2024 #### [Cannabis Use Is Rising Across The US – Except in One Key Group](https://420intel.com/blog/cannabis-use-rising-across-us-except-one-key-group) ## Amid changing attitudes and new legislation around the use of cannabis in the US, an increasing... [Cannabis Business News](https://420intel.com/blog/tag/cannabis-business-news) [![Cannabis sales slowing, market shares shifting](https://420intel.com/hs-fs/hubfs/AI-Generated%20Media/Images/A%20bustling%20cannabis%20retail%20store%20brightly%20lit%20by%20overhead%20displays%20showcasing%20various%20products%20Shelves%20lined%20with%20colorful%20packaging%20of%20cannabis%20flowers%20prerolls%20and%20vapes%20dominate%20the%20scene%20A%20diverse%20group%20of%20customers%20browse%20the%20aisles%20examining%20pr.jpeg?width=550&height=395&name=A%20bustling%20cannabis%20retail%20store%20brightly%20lit%20by%20overhead%20displays%20showcasing%20various%20products%20Shelves%20lined%20with%20colorful%20packaging%20of%20cannabis%20flowers%20prerolls%20and%20vapes%20dominate%20the%20scene%20A%20diverse%20group%20of%20customers%20browse%20the%20aisles%20examining%20pr.jpeg)](https://420intel.com/blog/cannabis-sales-slowing-market-shares-shifting) - [![Buzz](https://420intel.com/hs-fs/hubfs/Buzz-No%20Outline-2.png?width=80&height=80&name=Buzz-No%20Outline-2.png) Buzz](https://420intel.com/blog/author/buzz) - 17 April 2025 #### [Cannabis sales slowing, market shares shifting](https://420intel.com/blog/cannabis-sales-slowing-market-shares-shifting) A new report says the Canadian cannabis industry is continuing to show signs of slowing growth and... - [Follow us on Facebook](https://www.facebook.com/420intel) - [Follow us on LinkedIn](https://www.linkedin.com/420intel) - [Follow us on Twitter](https://twitter.com/420intel) - [Follow us on Instagram](https://www.instagram.com/420intel) Back to Top ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Buzz", "url" : "https://420intel.com/blog/author/buzz" }, "dateModified" : "2025-07-21T14:04:37.603Z", "datePublished" : "2025-07-21T14:04:37.000Z", "headline" : "Shocking Insights: Cannabis & Performance by Dr. Parsley", "image" : [ "https://420intel.com/hubfs/AI-Generated%20Media/Images/The%20image%20features%20Dr%20Kirk%20Parsley%20a%20ruggedly%20built%20man%20in%20his%20late%2040s%20sitting%20in%20a%20modern%20studio%20adorned%20with%20fitness%20equipment%20and%20books%20on%20health%20He%20has%20shortcropped%20hair%20and%20a%20serious%20expression%20as%20he%20leans%20slightly%20forward%20engaging%20in%20an%20animat.jpeg" ], "mainEntityOfPage" : { "@id" : "https://420intel.com/blog/shocking-insights-cannabis-performance-by-dr.-parsley", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://420intel.com/hubfs/Asset%2016.png" }, "name" : "420 Intel" } } ```