What the Research Actually Shows

The question of whether vaping affects taste and smell is more nuanced than a simple yes or no. The most robust study published on this topic to date found a specific and measurable difference in how vapers perceive sweet smells compared to non-vapers but found no significant differences in taste perception or the ability to detect savoury smells. The picture is different from smoking, where both taste and smell impairment are well documented and often severe.

Understanding the distinction between what is proven, what is probable and what remains unknown helps vapers make informed decisions about their habits and what to expect from their sensory experience over time.

The University of Otago Study: Key Findings

The most directly relevant research was published in the journal Appetite in 2024 by researchers at the University of Otago in New Zealand, working with the National Institute for Health Innovation. The study included 213 adults divided into vapers and non-vapers and measured both taste and smell perception using controlled sensory stimuli representing sweet and savoury categories.

Why Would Vaping Affect Sweet Smell Specifically?

The researchers proposed two main explanations for why vapers find sweet smells less pleasant, a phenomenon consistent with what has been observed in smokers but distinct from it in character.

The first explanation is sensory adaptation or olfactory desensitisation. The vast majority of popular e-liquid flavours sit in the sweet category: fruits, desserts, candy and menthol-sweet combinations. Vapers who use these flavours repeatedly throughout the day are exposing their olfactory receptors to high concentrations of sweet aromatic compounds. Over time this can blunt the perceived pleasantness of similar sweet smells in the real world, not because the ability to smell has degraded but because the reward signal associated with that smell has been recalibrated downwards by overexposure.

The second explanation involves nicotine itself. Nicotine is known to enhance the reinforcement value of stimuli when it is present in the system. When nicotine is absent, as it is when a non-vaper encounters a pleasant sweet smell without any nicotine context, the sensory reward from that smell may be experienced more strongly. In vapers, the brain may have adjusted to associating pleasant sweet aromas primarily with vaping sessions rather than with food or environmental smells.

How Vaping Compares to Smoking on Taste and Smell

Cigarette smoking causes well-documented, often severe impairment to both taste and smell. The heat of smoke damages the delicate sensory cells of the nasal epithelium. Tar and chemical deposits coat taste receptor surfaces on the tongue. Carbon monoxide and thousands of combustion byproducts cause broad chemical damage across the sensory system. Many long-term smokers lose significant portions of their ability to taste and smell, often without realising how much has been lost until they quit.

Vaping does not involve combustion, tar or carbon monoxide. The aerosol does not carry the same breadth of chemically damaging compounds. This is why vaping is associated with a much more limited effect on sensory perception compared to smoking. Smokers who switch to vaping frequently report a noticeable and sometimes dramatic improvement in their sense of taste and smell in the weeks and months after making the switch, as the damage from cigarette smoking begins to reverse.

Can Vaping Cause Dry Mouth and How Does It Affect Taste?

One of the most commonly reported sensory complaints among vapers is dry mouth, caused by the hygroscopic properties of propylene glycol drawing moisture from oral tissues. Saliva plays a critical role in taste perception: it dissolves flavour compounds from food and carries them to taste receptor cells on the tongue. When the mouth is very dry, taste perception can genuinely be impaired because there is less fluid to facilitate this process.

This means vapers who experience persistent dry mouth may notice that food tastes slightly blander or less vivid than normal, not because their taste receptors have been damaged but because the mechanism that delivers flavour compounds to those receptors is working with less lubrication. Staying well hydrated and increasing water intake throughout the day largely resolves this issue.

Will Taste and Smell Return to Normal if You Stop Vaping?

Based on what is known, any vaping-related impact on smell and taste perception is very likely to be reversible. The sensory adaptation effect tied to sweet aroma overexposure should normalise once the repeated heavy exposure stops. The dry mouth effects resolve quickly with rehydration. There is no evidence from current research that vaping causes the kind of structural or cellular damage to taste or smell organs that smoking causes, which means the recovery pathway should be shorter and more complete.

Smell can begin to improve within as little as 24 hours of stopping nicotine use, though the full sensory recalibration from long-term vaping likely takes longer. Switching to a wider variety of flavour profiles while continuing to vape, rather than relying exclusively on sweet categories, may reduce the hedonic adaptation effect without requiring complete cessation.

If you are looking to vary your flavour profile, Andy's Vape Shop has a broad catalogue covering tobacco, menthol, fruit and beverage-inspired ranges from established UK brands.