Does Nicotine Affect Muscle Growth? What 40 Years of Research Actually Says

Does Nicotine Affect Muscle Growth? What 40 Years of Research Actually Says

You popped a nicotine pouch before your last deadlift session. The focus felt sharper. The set felt dialed. So does nicotine affect muscle growth, or does that pre-lift ritual come with a cost you can't feel in the moment?

The honest answer: nicotine gives you a short-term cognitive bump while quietly undermining the biological machinery that builds muscle. Here's what four decades of research actually shows, broken down by acute (single-use) effects versus chronic (daily habit) consequences.

Key Takeaways:

• Nicotine produces a mild, short-lived stimulant effect that can sharpen focus before a workout.
• Chronic nicotine use impairs muscle protein synthesis, restricts blood flow, and elevates cortisol.
• The "focus benefit" of nicotine can be matched by caffeine and L-theanine without the muscle trade-offs.
• Pouches eliminate lung damage from smoking, but systemic vascular effects persist.

Acute vs. Chronic: The Nicotine and Muscle Growth Trade-Off

The confusion around nicotine and muscle growth exists because the acute and chronic effects point in opposite directions. This table summarizes what the research supports:

One column looks promising. The other five don't. That's the core tension: nicotine feels useful in the gym while systematically working against your recovery outside of it.

Does Nicotine Affect Muscle Growth? The Science of Impaired Protein Synthesis

The most cited study on this topic comes from Petersen et al. (2007), published in the American Journal of Physiology. The researchers compared muscle protein fractional synthesis rate (FSR) in eight smokers versus eight non-smokers. The results were stark: smokers had a muscle protein synthesis rate of 0.037%/h compared to 0.059%/h in non-smokers, a roughly 37% reduction. Myostatin expression, a protein that actively inhibits muscle growth, was 33% higher in smokers. MAFbx, a gene associated with muscle atrophy, was 45% higher (Petersen et al., 2007).

Now, a fair objection: that study examined cigarette smokers, not nicotine pouch users. Cigarette smoke contains thousands of compounds beyond nicotine. But here's what matters for anyone using pouches: the vascular and hormonal disruptions are driven by nicotine itself, not just combustion byproducts.

Nicotine activates the sympathetic nervous system, triggering vasoconstriction through α1-adrenergic receptors on vascular smooth muscle (PMC, 2021). That means less blood flow to working muscles during and after training, regardless of whether the nicotine came from a cigarette, a vape, or a pouch.

Does Nicotine Help Build Muscle? Addressing the Gym Claims

Three claims circulate in fitness communities. Let's address each one.

"Nicotine Increases Strength"

A 2022 study on baseball players using nicotine gum found no increase in muscle strength after acute nicotine intake. Heart rate went up. Cognitive markers showed small improvements. But the barbell didn't move faster (PMC, 2022). The short-term "strength" feeling likely comes from heightened arousal and sympathetic activation, not from any actual neuromuscular improvement.

"Nicotine Helps Fat Loss"

Technically, nicotine does raise resting metabolic rate by about 6.5% for roughly two hours after use (Jessen et al., AJCN). For a person with a 2,000 kcal daily expenditure, that's an extra ~13 calories per dose. You'd burn more energy standing up from the couch. The metabolic bump is real but trivially small, and it comes packaged with vasoconstriction and cortisol elevation that impair the recovery you need to maintain lean mass.

"Pouches Are Different Than Smoking"

This one is partially true. Nicotine pouches eliminate tar, carbon monoxide, and the thousands of combustion byproducts that destroy lung tissue. For respiratory health and VO2 max, that distinction matters. A 2025 randomized controlled trial published in Nature Scientific Reports found that people who quit smoking improved their VO2 max by 2.7 mL/kg/min over 12 weeks (Nature, 2025). Pouches sidestep the lung damage entirely.

But nicotine's systemic effects on blood vessels, cortisol, and muscle protein signaling don't depend on smoke. A nicotine molecule from a Zyn pouch activates the same nicotinic acetylcholine receptors and triggers the same sympathetic cascade as one from a cigarette. The delivery is cleaner. The drug is the same.

Nicotine Pouches vs. Caffeine + L-Theanine: A Head-to-Head for the Gym

If the real reason you reach for a pouch before training is focus, the question becomes: can you get that focus without the muscle trade-off?

The caffeine and L-theanine combination has strong clinical backing. A study published in Nutritional Neuroscience found that the pairing improved both speed and accuracy on attention-switching tasks while reducing susceptibility to distraction (Giesbrecht et al., 2010). A more recent double-blind crossover trial confirmed that a high-dose L-theanine and caffeine combination enhanced attentional focus by suppressing mind wandering (British Journal of Nutrition, 2025).

L-theanine smooths out caffeine's rough edges. You get alertness without the jittery, anxious quality that nicotine's sympathetic activation produces. And you skip the vasoconstriction entirely.

Is Nicotine Bad for Working Out? The Recovery Problem

The focus during a set is only half the equation. Muscle grows during recovery, not during the lift itself. And this is where chronic nicotine use does the most damage.

Blood flow restriction. Nicotine constricts blood vessels, reducing the delivery of amino acids, oxygen, and glucose to recovering muscle tissue. One review in the European Heart Journal described nicotine's effect as "sustained sympathetic activation" that elevates blood pressure and peripheral vasoconstriction with chronic exposure (European Heart Journal, 2025).

Cortisol elevation. Nicotine raises cortisol, a catabolic hormone that breaks down muscle tissue. Elevated cortisol after training directly opposes the anabolic signaling you need for muscle repair and growth (Medical News Today).

Impaired endothelial function. A 2024 study found that chronic e-cigarette users showed diminished blood vessel function, including impaired release of endothelial nitric oxide and decreased flow-mediated dilation (PMC, 2024). Nitric oxide is the molecule responsible for the "pump" you feel during training; less of it means less nutrient delivery when it matters most.

The net effect: you train hard, then spend the next 48 hours in a recovery environment that's actively working against you.

Frequently Asked Questions

Does nicotine help muscle pumps?

No. Nicotine is a vasoconstrictor, meaning it narrows blood vessels and reduces blood flow to skeletal muscle. The "pump" during resistance training depends on vasodilation and nitric oxide release. Chronic nicotine use impairs endothelial nitric oxide production, which can reduce the pump effect over time. If anything, nicotine works against the vascular response you want during a lift.

Does Zyn affect testosterone?

The data is mixed. A systematic review found that smoking was associated with higher total testosterone in men (Zhao et al., 2016). However, nicotine simultaneously raises cortisol, which is catabolic and opposes testosterone's muscle-building effects. The testosterone increase does not appear to translate into improved muscle outcomes given the other negative effects.

Is nicotine bad before a workout?

Acutely, nicotine raises heart rate by 10-15 bpm and increases blood pressure, which adds cardiac stress during exercise. It provides a mild focus boost, but no measurable increase in strength or power output. The cardiovascular strain and vasoconstriction likely outweigh the small cognitive benefit, especially if safer focus alternatives like caffeine and L-theanine are available.

Will quitting nicotine help my gains?

Yes. Removing chronic vasoconstriction improves blood flow to muscle tissue during recovery. Eliminating the cortisol elevation associated with nicotine allows anabolic signaling to function without interference. A 2025 trial found that quitting smoking improved VO2 max by 2.7 mL/kg/min over 12 weeks (Nature, 2025), suggesting measurable cardiovascular recovery that supports training performance.

Are nicotine-free pouches better for the gym?

If your goal is pre-workout focus without compromising recovery, yes. Nicotine-free pouches that use caffeine, L-theanine, and other nootropics deliver the alertness benefit through a different mechanism that doesn't involve vasoconstriction, cortisol spikes, or impaired protein synthesis. The trade-off profile is substantially better for athletes.

Does nicotine affect endurance performance?

Nicotine's effect on endurance is mostly negative. While acute nicotine use can increase heart rate and arousal, it also raises blood pressure and constricts peripheral blood vessels. Chronic use is associated with reduced VO2 max and impaired cardiovascular efficiency. Smokeless nicotine products avoid the lung damage of cigarettes, but the cardiovascular effects persist.

How long does nicotine affect muscle recovery?

Nicotine's half-life is about 2 hours, but its metabolite cotinine lingers for 15-20 hours. The vasoconstriction and cortisol effects can persist well beyond the perceived "buzz," meaning a pouch used at 3 PM is still influencing your recovery environment at midnight. For habitual users, these effects overlap continuously.

Related from Roon

• Quitting Nicotine Pouches: The 30-Day Recovery Guide (And What to Use Instead)
• Zyn + Coffee: Why Stacking Them Backfires (And What to Use for Real Focus)
• First-Time Nicotine Pouch Guide: What to Know (And When Nicotine-Free Makes More Sense)

The Bottom Line for Athletes

Nicotine gives you about 20-30 minutes of slightly sharper focus. In exchange, it impairs muscle protein synthesis by up to 37%, constricts the blood vessels that deliver nutrients to recovering muscle, and keeps cortisol elevated during the hours when your body is trying to rebuild.

That's not a good trade.

Your muscles do not care what gave you focus during the set. They care what is in your bloodstream for the 48 hours after. If the ritual matters to you, the question worth asking is whether the specific molecule driving it is the one you actually need, or just the one you reached for first.

The Same Ritual, Without the Recovery Tax

The argument this article makes is specific: nicotine's focus benefit is real but brief, and the chronic cost to muscle protein synthesis, blood flow, and cortisol is not. If you are using a pouch before training because the format works for you, that habit does not have to go. The format is not the problem. The nicotine is.

Roon is a zero-nicotine sublingual pouch built around 80 mg caffeine, 60 mg L-theanine, 25 mg methylliberine, and 5 mg theacrine. It is not a muscle-building supplement and it will not replace protein, sleep, or progressive overload. What it does is deliver sustained, clean focus for 6 to 8 hours through a mechanism that does not involve vasoconstriction, cortisol elevation, or impaired protein synthesis signals. The same pouch format. A different pharmacology.

If the pre-lift ritual is worth keeping, try Roon and keep everything else the same. Your recovery window will thank you.