Are scented candles toxic? What's actually known

Why won't you say whether candles are toxic?

Because we went looking for the evidence and did not find it. The National Candle Association's page about candle soot — the closest thing to an industry position on candle emissions — has been removed and returns a 404. We found no independent study comparing emissions between wax types that we could read and cite. Selling you candles while telling you they're perfectly safe, on no evidence, would be exactly the behaviour this page criticises.

Why is 'non-toxic' a problem as a marketing word?

Because it's unfalsifiable and it's a claim about safety. Under the Fair Trading Act, claims a business makes about its products have to be accurate and substantiated — the Commerce Commission applies the same standard to origin claims, and there's no reason a health claim gets an easier ride. A brand writing "non-toxic" on a candle is asserting something about what you breathe. If they can substantiate it, they should show you the substantiation. Most don't.

Some of what makers do say is precise and checkable, and that's different. NŌLA describes its wax as "natural plant based soy wax; free from paraffin, GMO and unnatural additives" — that's a composition statement about their own product, which they're in a position to know. "Non-toxic" is a conclusion about effects on you, which they aren't.

What has a New Zealand regulator actually raised concerns about?

Not candles — reed diffusers. Consumer NZ reported that of the 10 reed diffusers it bought, "only half had a safety message or hazard symbols", with two carrying no warnings at all, and that "the NZ Poison Centre has received nearly 600 calls since 2019 about kids getting into reed diffusers". Diffusers are hazardous substances regulated by the Environmental Protection Authority under the Hazardous Substances and New Organisms Act 1996, and labelling them is the manufacturer's or importer's job.

That's the reason this shop won't sell reed diffusers, room sprays or fragrance oils at launch. They carry a compliance obligation a candle does not, and we're not going to take it on until we've done the work properly. Several of the makers we admire do sell them — that's their call, and they've presumably done that work.

What can you do about it in the meantime?

• Ventilate. The National Candle Association's own safety list says to "burn candles in well-ventilated rooms". That's the one air-quality instruction we can source, and it's from the industry body.
• Trim the wick. The NCA's stated reason for trimming to ¼ inch before each use is "to prevent high flames and soot". Whatever the wax, a tall flame produces more soot than a short one.
• Avoid draughts. Open windows, fans and air vents make the flame flicker, which is when candles smoke. The NCA lists this as a safety rule; it happens to be a soot rule too.
• Keep them away from children and pets, which the NCA lists plainly, and which is by far the best-evidenced risk on this page — see the poison-centre figure above for the diffuser equivalent.

What about 'eco', 'sustainable' and 'natural'?

Same standard. If a maker says "100% natural, sustainable soy wax", as Candle Crush does, that's their claim and we'd quote it as theirs. We won't restate it in our own voice, because we haven't audited anyone's supply chain. There's no candle on this site described as eco, sustainable or green in words that belong to us.