The difference between vaporising and smoking comes down to one variable: temperature. Combustion happens somewhere around 230°C and above. Below that, you're heating plant material enough to release its volatile compounds without setting it on fire.
That sounds like a technicality. It isn't. Burning is a chemical process that creates entirely new substances that weren't in the plant to begin with, and most of what makes smoke harmful is a product of the fire rather than the material.
Here's what the research actually shows, and where it stops short.
What combustion produces
Burning any plant matter, tobacco, cannabis, wood, generates a predictable set of byproducts: carbon monoxide, tar, polycyclic aromatic hydrocarbons, benzene, formaldehyde, acetaldehyde and a long list of volatile organic compounds. None of these exist in the plant. They're created by the fire.
This is the central point, and it's why the comparison isn't really about cannabis at all. The question is whether you're inhaling combustion products or not.
What the studies show
The research base is smaller than for tobacco, but it points consistently in one direction.
Abrams et al., 2007. Published in Clinical Pharmacology & Therapeutics, this remains the most-cited clinical comparison. Researchers at San Francisco General Hospital ran an inpatient study where participants either smoked or vaporised cannabis using a Volcano across six days. The vaporiser delivered comparable THC while substantially reducing exposure to combustion byproducts, with carbon monoxide levels the clearest difference.
Earlier lab work. A study by California NORML and MAPS, conducted by Chemic Labs, found that vaporisation could largely eliminate the toxins found in cannabis smoke while still delivering cannabinoids.
Self-reported respiratory symptoms. A survey study published in Harm Reduction Journal found cannabis users who vaporised reported fewer respiratory symptoms, coughing, phlegm, chest tightness, than those who smoked. Self-report has obvious limitations, but the direction matched the lab findings.
Device validation. A 2016 PLOS ONE study tested five different vaporisers and found all released cannabinoids efficiently with minimal benzene or toluene, suggesting the effect isn't limited to expensive devices.
Recent manufacturer research. In April 2026, PAX published lab work comparing a joint against their own devices under standardised puffing conditions, testing sixteen harmful or potentially harmful compounds and reporting reductions of up to 99%. Worth reading, and worth noting it was conducted by a vaporiser manufacturer with a commercial interest in the result. Independent replication carries more weight.
The honest caveats
We sell vaporisers, so treat what follows as us being careful rather than modest.
Reduced harm is not the absence of harm. Vaporising is not established as safe. It's established as producing fewer combustion byproducts, which is a narrower claim. Inhaling anything into your lungs carries some risk.
The evidence base is thin. Decades of prohibition made this research difficult to fund and run. Most studies are small, short-term, and often industry-adjacent. There is nothing here comparable to the long-term epidemiology available for tobacco.
Temperature matters, and people get it wrong. Run a device hot enough and you can approach combustion anyway. The margin between efficient vaporisation and scorching is smaller than most people assume, and cheap devices with poor temperature control narrow it further.
Device quality is a real variable. Poorly made vaporisers with unsuitable materials in the airpath can introduce their own problems. This is one area where the price difference buys something concrete.
Nothing here addresses the substance itself. Cannabis carries its own risks independent of delivery method, including for mental health, and this article isn't about those.
The practical differences
Beyond the health question, several things change in daily use.
Taste. The most immediately obvious difference. Terpenes, the compounds responsible for aroma and flavour, largely burn off during combustion. At lower vaporisation temperatures they survive, and people are often surprised that material they'd smoked for years tastes of something specific.
Efficiency. A burning joint loses a substantial share of its active compounds to the air between draws. A vaporiser only heats when you're actually using it.
Smell. Vapour smells, but it's fainter and it clears far faster. It doesn't embed in fabric and hair the way smoke does.
Control. Temperature is a variable you can actually adjust. Lower settings give lighter, more flavour-led results; higher settings give denser vapour.
The trade-offs. Upfront cost, charging, cleaning, and a genuine learning curve. Grind consistency and packing density affect results far more than they do with a bowl, and the first few sessions with a new device are usually the worst ones.
A note on legal context
Cannabis remains a controlled substance in the UK outside of a specialist prescription. Where flower is prescribed here, vaporisation is the specified route of administration and smoking it stays illegal, we've covered that in our post on UK medical cannabis and vaporisers. The dry herb vaporisers we sell are for legal herbs and botanicals and for use in accordance with the law where you are.
Frequently asked questions
Is vaporising safer than smoking?
The evidence indicates it produces substantially fewer combustion byproducts. "Fewer harmful byproducts" is not the same as "safe", and the long-term research doesn't yet exist.
What temperature should a dry herb vaporiser run at?
Most devices operate roughly between 180°C and 210°C. Lower favours flavour, higher favours vapour density. Combustion begins around 230°C.
Does vaporising smell?
Yes, but noticeably less, and it disperses far more quickly than smoke.
Is vapour weaker than smoke?
It feels different rather than weaker. It's less harsh, which people sometimes read as less effective, and the onset can feel gentler.
Do I need an expensive vaporiser?
Not necessarily, and lab work has found cheaper devices can vaporise cleanly. What you're paying for at the top end is temperature accuracy, build quality, warranty and parts availability.
Can I use my vaporiser with a bong?
Many portable devices are water-pipe compatible with the right adapter, which cools the vapour further at higher temperatures.
Our vaporisers collection covers dry herb devices from Storz & Bickel, Arizer, PAX and DynaVap, and if you're comparing the two best-known portables, our Venty vs Mighty+ guide goes through it in detail. For the nicotine side of the same argument, see our post on what the evidence says about vaping versus smoking.
18+ only. This article is general information, not medical or health advice. Sold for use with legal herbs and botanicals in accordance with UK and Irish law.