Cannabis usage in older adults linked to larger brain, better cognitive function

Alcohol vs “Drugs” and Moral Framing

• Several comments object to “Alcohol and Drugs” as a phrase, arguing alcohol is a drug and is among the most harmful, but socially grandfathered.
• Others defend distinguishing alcohol from “most drugs” on moral grounds: recreational intoxication that impairs reason is framed as intrinsically immoral, with the law seen as a teacher against such behavior.
• Counterpoints note that many legal substances (alcohol, caffeine, nicotine, cannabis) are all just drugs and the distinction is largely cultural and political.

Study Design, Causation, and Confounders

• Multiple commenters question whether the study is controlled or merely correlational.
• A recurring criticism: cannabis use was mostly in youth, but brain volume and cognition were measured later, which is likened to “reading tea leaves.”
• Others suspect unaddressed confounders (e.g., SES, intelligence, political attitudes) and expect the result to fail replication.
• Paywalled publication is criticized as undermining credibility: claims can’t be evaluated without full access.

Cost, Access, and Socioeconomic Bias

• One line of argument: in the UK context weed is relatively expensive; users may be wealthier and more educated, which itself correlates with better cognition.
• This is challenged by people noting that in many legal US markets cannabis is now cheap and widely accessible.

Cognitive Effects, Addiction, and Long-Term Use

• Strongly mixed anecdotes:
  • Some long-term daily or heavy users report worsened memory, reduced motivation, slower responses, poor sleep, and later regret.
  • Others say their memory fully recovers after quitting, or that they function well even with decades of use.
• Addiction is debated: some say most users are “addicts in denial”; others report stopping for months with no withdrawal, while opponents cite sweating and discomfort as evidence of real (if milder) dependence.
• Another study is cited linking long-term heavy use to increased dementia risk; moderation is emphasized.

Medical and Neuroprotective Claims

• Some point to known anti-inflammatory and neuroprotective mechanisms of cannabinoids and prior work on neurogenesis, suggesting a plausible pathway for brain benefits.
• Others counter that there is “no chemical shortcut to brain health” and that any benefit is secondary to treating conditions like pain, epilepsy, PTSD, or anxiety.
• Several medical users report major quality-of-life improvements and strong support from their physicians, while skeptics maintain most “medical” use is effectively recreational.

Gateway Drug Debate

• One camp insists cannabis is clearly a gateway drug, based on personal trajectories from weed to other substances and social circles where multiple drugs co-occur.
• Another camp argues the “gateway” is largely environmental and legal: dealers and illegal networks expose users to other drugs; legal dispensaries and home-grow likely reduce that effect.
• Some broaden this to say alcohol is also a gateway drug; others try to differentiate “gateway to alcoholism” vs “gateway to harder drugs.”

Legalization, Public Behavior, and Nuisance Smell

• Several commenters report that legalization (e.g., in California, Minnesota) coincides with what they see as deteriorating “everyday intelligence,” increased all-day use, and impaired driving. Others attribute societal decline to broader issues (phones, modern stress).
• Strong complaints about the smell in public spaces, especially around children; countered by comparisons to car exhaust and perfume, leading to a debate over whataboutism vs relative harm.
• Some advocate edibles or private use as a courtesy; others stress how intense and pervasive cannabis odor is to non-users and how quickly smokers become noseblind.

Overall Attitude Toward the Article

• Many see the “bigger brains, better cognition” angle as pop-science or “free lunch” messaging.
• Several balance the discussion: plausible neuroprotective upsides and clear medical use cases vs real, under-discussed downsides of regular or heavy recreational use.