Meg Caldwell Bought It Legally Every Time. It Killed Her Anyway.

Kathleen Dial’s sister told her, more than once, that what she was doing was legal. “She would tell us, I’m buying this legally. I’m not doing anything wrong,” Dial later said. Margaret “Meg” Caldwell was 29, from Clermont, Florida, and for years she inhaled nitrous oxide — the same gas dentists use, sold to her in flavored canisters with names like mango smoothie and watermelon lemonade — often hundreds of times a day. In September 2024, an overdose temporarily took the use of her legs. A doctor warned her sister Leigh directly: “You are going to die if you keep using this drug.” Two months later, Meg’s body was found behind an Orange County, Florida smoke shop where she’d bought the canisters that killed her. Her family is now suing to stop the company that sold it — Galaxy Gas — from selling it to anyone else.

The gas is legal. The marketing is new. The damage it does to a spinal cord has not changed in two hundred years.

Nitrous oxide is having a rebrand, and the rebrand is working. What used to be a canister of whipped-cream propellant, diverted from a catering-supply tank and inhaled through a balloon at a concert, is now sold directly to consumers online and in vape shops as a stand-alone recreational product — in candy flavors, with influencer-friendly packaging, under names like Galaxy Gas, Cosmic Gas, and Baking Bad. You don’t need a whipped-cream dispenser anymore. The canister is the product.

Why it feels the way it does, and why that’s exactly the problem

Nitrous oxide works on the same receptor system as ketamine and PCP — it’s an NMDA-receptor blocker, which is the pharmacology behind the floaty, sound-warped, dissociated feeling users describe — combined with a rapid drop in oxygen to the brain from simply displacing the air you’d normally breathe. Put in plainer terms: part of the high is your brain being starved of oxygen for a few seconds, on purpose, over and over. That combination produces a high that hits almost instantly and fades in one to five minutes, which is precisely what makes it easy to lose count of how many you’ve done. The National Capital Poison Center documents real, anonymized cases of respiratory distress, collapse, and spinal cord damage from exactly this redosing pattern. In Meg Caldwell’s case, “hundreds of times a day” wasn’t an exaggeration in a lawsuit filing — it’s the mechanical consequence of a drug that only lasts a few minutes and is sold in bulk.

Whether nitrous oxide is “addictive” in the classic sense — tolerance, physical withdrawal — is a genuinely live scientific argument, not settled the way it is for opioids. A 2024 commentary in the peer-reviewed journal Addiction argued that the label “potentially addictive” may do more harm than good, pointing out that the evidence for classic dependence criteria is weak and that what’s happening is better described as a mild use disorder. If you or someone you know has ever felt pulled to do “just one more” balloon at a party without ever craving nitrous the next morning, that distinction is real — this isn’t the same shape of hook as fentanyl or alcohol. But “not classically addictive” and “not dangerous” are two different claims, and the second one has never been true.

What it does to a spinal cord, and why it takes people by surprise

Here’s the mechanism that actually kills or paralyzes people, and it has nothing to do with overdose in the way you’d picture it: nitrous oxide oxidizes the cobalt atom at the center of vitamin B12, permanently disabling it as a helper molecule your body needs to make myelin — the insulation around your spinal cord’s nerve fibers. Do this heavily and repeatedly, and your spinal cord starts losing that insulation from the inside, a condition with the clinical name subacute combined degeneration. One published case report describes a patient using 50 to 100 canisters a day who developed numbness, loss of balance, and weakness — a slow-motion injury that shows up on a blood test as normal B12, because the vitamin is present but chemically disabled, not depleted. Recovery, with high-dose B12 injections, is often partial. Some of the damage doesn’t come back. Rachael Kelly, who began using nitrous oxide in 2018, became paralyzed in 2024 and now speaks publicly about it — a body count in this story that isn’t a death count, which is its own kind of warning most drug-safety messaging isn’t built to carry.

Do this heavily and repeatedly, and your spinal cord starts losing that insulation from the inside, a condition with the clinical name subacute combined degeneration.

None of this is new physiology. What’s new is the surveillance catching up to a marketing shift. The CDC’s April 2025 report on Michigan tracked poison-center cases rising from 10 in 2019 to 48 in 2023, emergency-department visits from 7 to 60, and EMS responses from 15 to 78 — with 14 of those 192 EMS responses involving a death, three of them suspected suicides. The people showing up in these numbers were mostly in their late 20s and early 30s, concentrated in metro counties, and roughly 30% had also used something else — usually benzodiazepines, cannabis, or alcohol — the polysubstance pattern that makes any single-drug overdose harder to predict and treat. Nationally, America’s Poison Centers logged a 58% increase in intentional nitrous oxide exposure reports between 2023 and 2024 alone — the same window Galaxy Gas-branded products went from a niche find to a checkout-counter item.

The FDA responded in March 2025 with a consumer warning naming eleven specific brands and listing the health effects plainly: asphyxiation, blood clots, frostbite, limb weakness, paralysis, psychiatric disturbance, B12 deficiency, and death — flagging that some of it, like the spinal damage, “can be permanent.” It’s a consumer advisory, not a ban, which means it warns you but doesn’t stop the shelf from being restocked.

A gas with a two-hundred-year history of being called harmless

Nitrous oxide has been treated as the safe, laughing-gas exception to drug panic since Humphry Davy inhaled it recreationally at the Pneumatic Institution in the 1790s and pronounced it delightful. It moved through 1960s “hippie crack” concert culture, then into decades of festival balloon vendors filling hundreds of canisters a night, always with the same cultural shrug: it’s a party gas, it’s legal, it’s not a real drug. Britain tested that shrug directly. Nitrous oxide possession for recreational use was technically legal there — only supplying it for that purpose was banned — until the UK reclassified it as a Class C controlled drug on November 8, 2023, making possession itself illegal unless you can show a legitimate use like catering or medicine. The U.S. is now watching a scattered version of the same reckoning play out state by state rather than in one federal move: 45 states currently limit recreational nitrous oxide use in some form and 12 criminalize possession outright, with South Carolina, Oregon, Washington, and Oklahoma passing new restrictions on flavored products and sales to minors just in the past year, and a federal bill — the Nitrous Oxide Safety Act — sitting in Congress.

We’ve watched this exact pattern before with a different inhalant: legal, sold at retail, marketed as harmless because it wasn’t scheduled, until the injury reports forced regulators to catch up years after the damage had already been done to the first wave of people who trusted the label “legal” to also mean “safe.” Meg Caldwell trusted that distinction. It cost her the ability to walk for two months before it cost her everything.

If you’re a provider screening intake, ask about nitrous oxide directly — it won’t show up on a standard drug panel, and a patient with new numbness, balance problems, or unexplained weakness and a normal B12 level on paper may need a methylmalonic acid test to catch what the standard screen misses. If someone in your life is using it heavily, the thing to say isn’t “stop” delivered as an ultimatum — it’s the same offer that works for any compulsive use: naming what you’ve noticed, staying in the room, and getting a B12 level checked before numbness becomes permanent. Kathleen Dial’s sister believed “legal” meant “not a real drug” until a doctor told her otherwise. She isn’t the last person who’s going to need to hear that distinction made out loud, before the canister count gets into the hundreds.

She isn’t the last person who’s going to need to hear that distinction made out loud, before the canister count gets into the hundreds.