If you spend any time on social media, you may have noticed a curious trend: wellness influencers singing the praises of nicotine. Not smoking or vaping but nicotine patches and pouches, repackaged as cognitive enhancers, productivity boosters and even weight-loss aids. But does the science support this rebrand, or are we watching a familiar substance undergo a very modern makeover?
Nicotine is primarily a stimulant and derived from the tobacco plant. Small amounts of nicotine are also found in other members of the nightshade family, including tomatoes, aubergines, potatoes and green peppers. However, the levels in these foods are minimal compared with those in tobacco.
Nicotine works by latching on to specific receptors found throughout the body, triggering the release of various brain chemicals such as dopamine, noradrenaline, and serotonin. These receptors, along with a chemical messenger called acetylcholine, play an important role in attention, learning and memory.
The evidence on whether nicotine can enhance cognitive performance is mixed. One large review of 41 trials involving healthy adults – both non-smokers and smokers – found that nicotine produced small improvements in areas such as fine motor skills, attention and aspects of short-term and working memory.
An animal study demonstrated nicotine increased working memory and boosted levels of brain-derived neurotrophic factor, a protein important for learning and brain resilience. However, other research shows that in healthy non-smokers, nicotine often has neutral or even negative cognitive effects.
This difference comes down to starting point. People who already have cognitive difficulties have more room to improve, while those with healthy brain function are already performing close to their best. Because of this, nicotine is unlikely to offer any real benefit to people who don’t have cognitive impairments.
Small experimental studies have explored whether nicotine patches might help people with mild cognitive impairment, with one trial reporting slight improvements in memory test scores over six months. Research suggests nicotine may have protective effects in neurodegenerative diseases like Alzheimer’s and Parkinson’s, partly because it reduces inflammation, prevents cell death and supports cognitive function.
Nicotine has also been linked to weight loss and reduced appetite. It appears to influence the parts of the brain that control hunger and makes the body burn more energy by triggering the release of stimulating hormones like adrenaline. While some animal studies suggest nicotine can reduce body weight by speeding up fat burning, there is not yet strong evidence that this holds true in humans
Where nicotine is useful is in smoking cessation. Nicotine replacement therapy is an effective way to help people stop smoking. But this benefit comes from reducing exposure to tobacco smoke, which contains a cocktail of chemicals and cancer-causing agents – not from nicotine itself being healthy.
Highly addictive
Nicotine is not harmless and regular use can lead to dependence. Nicotine activates receptors in the brain that trigger the release of several chemical messengers, including dopamine (the so-called feel-good hormone). This surge in dopamine creates the pleasurable sensations and reinforcement that contribute to nicotine’s addictive effects.
Studies in animals show using nicotine during the teenage years can lead to long lasting changes in the brain and behaviour, including higher risk of other drug use, reduced attention and mood problems.
Teenagers have more nicotine receptors in the brain’s reward areas than adults, which makes nicotine’s effects stronger and the developing brain more vulnerable. Similar effects can be seen in a developing baby during pregnancy.
Common side-effects of using nicotine include nausea, vomiting and headaches. It can also cause more serious heart and blood-vessel harms.
Nicotine triggers the release of chemicals such as adrenaline and noradrenaline, and studies show that higher levels of these can raise heart rate, increase blood pressure and make the heart work harder.
Nicotine also damages the inner walls of blood vessels by causing inflammation, raising blood pressure and disrupting normal blood vessel function. The evidence is clear that no nicotine product is safe for the heart and cardiovascular system – a conclusion now officially backed by major health organisations, including the World Health Organization.
Is nicotine safer without smoke? Yes. Is it safe? No.
Reduced harm is not the same as benefit. The scientific picture is complicated: possible cognitive effects, potential therapeutic avenues, but clear risks and strong addictive potential.
The science does not support using nicotine as a cognitive enhancer or lifestyle supplement for healthy adults. What it does support is using nicotine replacement therapy to help people stop smoking. Outside that context, the risks outweigh the hype. Wellness trends come and go, but addiction is far harder to shake.
Dipa Kamdar does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.
This article was originally published on The Conversation. Read the original article.
