Bryan Johnson, a prominent American entrepreneur known for his efforts to combat aging, recently addressed the health implications of marijuana use in an Instagram reel. Citing a new study, Johnson explained that both smoking and consuming cannabis can significantly reduce blood flow, akin to the effects of tobacco. The study found a 40% decrease in blood flow for smokers and a 50% reduction for those consuming cannabis in edible form. This was measured using flow-mediated dilation (FMD), which evaluates how well blood vessels expand in response to increased blood flow. Johnson emphasized that his message was not an anti-marijuana stance but rather a public service announcement about maintaining heart health. He stated, “This is not an anti-weed rant. This is a pro-blood flow PSA. Just like tobacco, cannabis may come at the cost of a healthy heart. So, whether it’s in a pipe or a brownie, weed does not vibe with your longevity.” The video quickly went viral, sparking diverse reactions from viewers. Some agreed with Johnson’s perspective on the potential risks associated with marijuana use, while others prioritized enjoying life over concerns about longevity. One user commented on the benefits of abstaining from cannabis, noting improvements in sleep, breathing, and social interactions. Conversely, another viewer criticized Johnson’s reliance on correlational studies, accusing him of manipulating public perception without definitive causation. A third commenter encouraged focusing on activities that promote longevity and heart health. Bryan Johnson has garnered significant attention for his extravagant investments in experimental anti-aging treatments. At 47 years old, he is known for undergoing radical procedures such as receiving blood transfusions from his teenage son. Johnson reportedly spends $2 million annually on medical diagnostics and treatments, alongside a strict regimen of diet, sleep, and exercise, in his quest to slow down or even reverse the aging process.