Yes, vaping affects cardio performance through several physiological mechanisms. Nicotine triggers an adrenaline spike that raises heart rate and blood pressure, even at rest. It causes vasoconstriction throughout the circulatory system, narrowing blood vessels and reducing oxygen delivery to muscles. A 2024 Les Mills-cited study confirmed that young people who vape perform worse in exercise tests than non-vapers, with exercise performance on par with cigarette smokers. UK fitness research from the NFHS (October 2023) suggested vaping can reduce lung capacity by up to 20%.

Three specific cardio effects are well-documented. First, reduced VO2 max: the maximum amount of oxygen your body can use during intense exercise, the gold-standard measure of cardiovascular fitness. Vapers show measurable decreases in forced expiratory volume (FEV1) and peak exercise capacity. Second, elevated resting heart rate: nicotine triggers adrenaline release that raises baseline heart rate by 5-10 beats per minute even when not exercising. Your heart works harder before training even begins. Third, vasoconstriction: narrowing of blood vessels forces the heart to pump against increased resistance, while simultaneously reducing oxygen and nutrient delivery to working muscles.

The picture is more nuanced for ex-smokers. Many people switching from cigarettes to vape report improved cardio performance within weeks, primarily because vape eliminates carbon monoxide (which binds haemoglobin and reduces oxygen-carrying capacity), tar (which damages lung tissue), and the 7000+ other smoke chemicals. NHS guidance and Cancer Research UK both note that for ex-smokers, vape is much less damaging to cardiovascular fitness than continuing to smoke. For never-smokers, vape is a net negative for cardio compared with no nicotine use at all.

How nicotine specifically affects exercise performance

Nicotine works at the autonomic nervous system level, activating the sympathetic (“fight or flight”) branch that prepares the body for short bursts of intense activity. This is helpful in emergencies but counterproductive for sustained aerobic exercise. The effects: heart rate rises by 5-10 bpm at rest, blood pressure increases by 5-10 mmHg systolic, peripheral blood vessels constrict (reducing muscle blood flow), and the body shifts toward glucose burning rather than fat burning. For sustained cardio (running, cycling, swimming), this combination reduces endurance, accelerates fatigue and slows recovery. For short anaerobic bursts (sprinting, lifting), the effect may actually appear neutral or even slightly stimulating in the short term, but cumulative damage from chronic use still hurts overall fitness.

Why ex-smokers often improve cardio after switching to vape

Three reasons. First, no carbon monoxide: cigarette smoke produces CO that binds haemoglobin with 200x stronger affinity than oxygen, blocking oxygen transport. CO levels drop within hours of stopping smoking. Vapers have non-smoker CO levels. Second, no tar: tar coats lung tissue and impairs gas exchange. Vape produces no tar. After 2-12 weeks of vape (vs smoking), lung function measures often improve. Third, no smoke chemicals: 7000+ compounds in smoke include many that directly impair cardiovascular function. Switching from smoking to vape removes these. Studies of UK smokers transitioning to vape typically show measurable VO2 max improvements within 4-12 weeks. However, switching to vape is not the same as stopping nicotine entirely; the nicotine effects on heart rate and vasoconstriction remain.

Practical strategies for vapers who train

Five strategies. First, last vape session at least 1-2 hours before training: lets adrenaline and heart rate elevation subside before exercise stress. Second, hydrate aggressively: PG and VG cause dehydration which impairs cardio performance and recovery. Aim for 2-3 litres water daily plus extra around training. Third, lower nicotine strength: 20mg/ml has more sympathetic effects than 10mg/ml; stepping down reduces vasoconstriction and resting heart rate. Fourth, recovery focus: vapers have slower recovery due to nicotine’s effects on tissue repair; allow extra rest days. Fifth, consider quitting if cardio is a priority: NHS Stop Smoking Services treat fitness improvement as a legitimate quit motivation and offer free support.

For UK vapers serious about cardio fitness, the five strategies below minimise vape impact on training and recovery without requiring complete cessation.

For UK vapers competing in cardio-intensive sports (cycling, running, triathlon, swimming), the marginal performance gains from stopping vape are significant. World Anti-Doping Agency (WADA) monitors nicotine use without banning it, recognising both its stimulant properties and harm. For most amateur athletes, the cardio improvements from quitting nicotine outweigh any perceived benefit. Our Omagh and Strabane teams can advise on stepdown protocols if you want to reduce strength gradually to minimise withdrawal effects on training during the cessation period.