There are four common causes, and only one of them is your concentrate. Work through them in order — the first two account for most cases.
1. Your banger is dirty
This is the most common answer by a wide margin, and the most commonly missed, because a banger can look acceptable and still be the problem.
Residue left in the dish doesn't just sit there. On your next heat cycle it carbonizes, and carbonized oil tastes like burnt oil. You're not tasting your concentrate — you're tasting everything you dabbed before it.
The tell: flavour that carries between sessions. If today's dab has a hint of what you smoked yesterday, or if everything tastes vaguely the same regardless of strain, that's residue.
Fix: swab after every dab while the quartz is still warm, and soak the banger in cleaning solution weekly. See how often to clean your banger for the schedule.
2. You're dabbing too hot
Terpenes — the compounds carrying all the flavour — vaporize at relatively low temperatures. Push past roughly 700°F and you're not vaporizing them, you're combusting them. Combustion tastes like smoke because it is smoke.
The tell: harsh on the throat, thick visible clouds, dark residue left behind. If your dab sizzles aggressively and instantly turns black when it hits the quartz, you went too hot.
Fix: heat until glowing, then wait longer than you currently do before dropping the dab. Add ten seconds to your count and see if it improves. Full breakdown in the best temperature for dabbing.
3. Cotton fibres in the dish
An underrated one. Pharmacy cotton buds are loosely wound and shed fibres, and those fibres stay in the dish after you swab. On the next heat cycle they burn — and burning cotton tastes exactly like burnt.
The tell: a burnt taste at the very start of the dab that fades, or visible lint in the dish when you look closely in good light.
Fix: use a swab that doesn't shed. Purpose-made dab swabs are tightly wound specifically to avoid this — our Original Tips use densely packed organic cotton on a rigid bamboo handle rather than the loose fluff on a pharmacy bud. Available across Canada with fast domestic shipping.
4. Cleaning solution residue
If you soaked your banger and didn't rinse thoroughly, you're tasting cleaner. It's distinctive — chemical rather than smoky, and unpleasant in a different way from burnt oil.
The tell: the bad taste appeared right after you deep-cleaned.
Fix: rinse with warm water far more thoroughly than feels necessary, then dry completely before heating. If in doubt, rinse again.
Narrowing it down by when it happens
The timing within a single dab is a useful diagnostic, and most people never think to notice it.
Bad at the very start, then fine. Something was already sitting in the dish before your concentrate arrived — cotton fibres, dust, or leftover cleaner. It burns off in the first second and then you're tasting the actual dab.
Fine at the start, bad at the end. You're running out of concentrate and heating the residue underneath it. Either your dab was too small for the temperature, or old residue is being reached as the fresh oil clears.
Bad throughout, evenly. Temperature, or a genuinely dirty banger. Check the quartz first, then lower your heat.
Bad only on the first dab of a session. Classic sign of residue that set while the piece sat unused. Swab before you store it, not just during use.
Getting gradually worse over weeks. Accumulation. You need a soak, not a technique change.
Less common causes
Chazzed quartz. If your banger has permanent dark discolouration baked into the surface, that carbon holds and releases flavour from old dabs. A soak may lift surface carbon; etched quartz is permanent. See how to fix a chazzed banger.
Low-quality concentrate. Poorly purged extract retains residual solvent, which tastes chemical and harsh regardless of your technique. If your gear is clean and your temperature is right and it still tastes wrong, consider the source.
A dirty rig. Water that hasn't been changed in a fortnight will affect flavour. Change it.
Torch fuel. Cheap unrefined butane can leave a taste. Refined fuel is worth the small extra cost.
Dirty accessories. Carb caps and terp pearls sit directly in vaporizing oil and get forgotten. Dirty pearls in a clean banger will still muddy your flavour.
Degraded concentrate. Extract left in warmth and light loses terpenes and oxidizes. If it's darkened or gone hard, age may be the answer.
Working through it
Start with the free ones. Change your water and clean your banger properly — a full cold soak, not a quick wipe. Then take a dab at a noticeably lower temperature than usual.
If that fixes it, you had a residue or heat problem, and it's a maintenance habit rather than a one-time repair.
If it doesn't, look at your swabs for shedding, then your accessories, then your concentrate.
Change one thing at a time. Cleaning everything and lowering your temperature simultaneously will fix the taste and teach you nothing about what caused it.
The pattern underneath most of this
Three of the four main causes come back to residue — either oil you didn't remove, or cotton you left behind while removing it. Dabbing is a clean-as-you-go activity, and the four seconds after each dab decide how the next one tastes.
Swab while the quartz is warm. Get the corner where the wall meets the floor. Use something that won't leave fibres behind.
The short version
Dirty banger first, temperature second, cotton fibres third, cleaner residue fourth. Pay attention to when in the dab the taste appears — it usually tells you which. Most burnt-tasting dabs are a cleaning problem wearing a disguise.