“I only smoke a few cigarettes.” Really? But the body counts every time.

In my work, I often meet people who are convinced that “a few cigarettes” can’t really make a difference.
In reality, our body records every daily choice; it doesn’t think in terms of “only”.
Every cigarette triggers systemic biological processes that involve our entire body.

When it comes to smoking, many people primarily think of the lungs. In reality, smoking involves the entire body: heart, brain, skin, metabolism, energy, sleep, fertility, and even the mechanisms that regulate the expression of our genes.

Today, science shows us something even more fascinating and disturbing: smoking does not only act “in the present” in our body, but it can leave biological traces that can affect our children and future generations.

Smoking does not just mean introducing nicotine, but exposing the body to thousands of chemical substances, many of which are pro-inflammatory and oxidative. This creates a state of continuous biological stress that accelerates many processes associated with aging and loss of well-being.

There are over 7,000 chemicals in cigarette smoke. These include:

• tar
• carbon monoxide
• formaldehyde
• benzene
• heavy metals
• carcinogens

Nicotine is the molecule responsible for addiction, but it is not the only problematic component. The combustion of a cigarette actually produces a toxic mixture that affects many organs and systems.

Smoking increases cardiovascular risk because it promotes:

• inflammation of blood vessels
• increased oxidative stress
• arterial stiffening
• alterations in blood pressure

Simply put: the blood carries less oxygen and the heart works under more difficult conditions.

Smoking accelerates skin aging because it reduces oxygenation and collagen production. This can result in:

• duller skin
• loss of elasticity
• premature wrinkles
• worsening of skin quality

Many smokers report tiredness, shortness of breath, and lower recovery capacity. This happens because:

• tissue oxygenation decreases
• inflammatory stress increases
• respiratory function worsens

Nicotine is a stimulant substance. Even though some people associate smoking with relaxation, it can actually:

• increase nervous system activation
• worsen sleep quality
• increase irritability and addiction

Often the feeling of “calm” simply comes from the temporary reduction of nicotine withdrawal.

Many people think that electronic cigarettes are harmless. In reality, the situation is more complex.

E-cigarettes eliminate tobacco combustion, but they are not without biological effects. The liquids can contain:

• nicotine
• irritants
• chemical flavorings
• compounds that, when heated, generate toxic molecules

Research shows that vaping can also promote:

• inflammation
• oxidative stress
• respiratory tract irritation
• cellular alterations

Furthermore, nicotine remains a highly addictive substance, especially among young people.

The good news is that the body has an extraordinary capacity for recovery.

Just a few weeks after quitting smoking, improvements in circulation, oxygenation, and respiratory function are observed. Over time, cardiovascular and inflammatory risks also decrease.

From an epigenetic perspective, several studies suggest that some alterations can progressively decrease after smoking cessation.
Quitting smoking doesn’t just mean “breaking a habit,” but investing in energy, mental clarity, longevity, and quality of life.

After 20 minutes
Heart rate and blood pressure begin to drop.

After 12 hours
The carbon monoxide level in the blood decreases and oxygenation improves.

After a few weeks

• circulation improves
• lung capacity increases
• feeling of fatigue decreases

After a few months
Many people report:

• more energy
• better sleep quality
• brighter skin
• improved sense of smell and taste

In the long term
Reducing or eliminating smoking means progressively decreasing cardiovascular, respiratory, and oncological risks.

The brain and metabolism can also benefit from nicotine cessation.

In recent years, research has explored the link between smoking and epigenetics.

Epigenetics studies how environment, diet, stress, and lifestyle influence the activation of our genes.

DNA can be imagined as a large book. The genes are the pages. Our daily habits help decide which pages will be “read”.

Smoking can alter these mechanisms through changes called “DNA methylations”. In practice, some toxic substances influence how our body uses certain genetic information.

This can promote:

• increased inflammation
• accelerated cellular aging
• metabolic alterations
• greater vulnerability to various diseases

The most interesting part is that some changes appear to be at least partially reversible when you stop smoking.

Some studies suggest that exposure to smoke and nicotine can leave biological marks associated with epigenetic modifications that are also observable in offspring.

In particular:

• smoking during pregnancy can influence fetal development
• prenatal exposure to nicotine can interfere with lung and neurological development
• some epigenetic alterations could persist over time

This doesn’t mean that every child of smokers will develop health problems, but that the parents’ lifestyle can biologically influence the environment in which the child develops.

Quitting smoking does not simply mean eliminating a cigarette. It often means breaking daily automatisms, managing emotions and stress differently, and changing habits built over time.

Nicotine addiction does not only involve willpower, but also complex neurological, behavioral, and emotional mechanisms. For this reason, the most effective approaches are generally integrated ones.

Tools that can help include:

• setting a specific start date
• recognizing situations most associated with smoking (coffee, breaks, phone calls, driving, stress)
• gradually changing certain automatic routines
• increasing daily movement and physical activity
• taking care of sleep quality and recovery
• using breathing, mindfulness, or relaxation techniques
• seeking medical or psychological support when necessary

Nutrition can also play an important role. A balanced diet, rich in fiber, proteins, and micronutrients, can help stabilize energy, emotional eating, and irritability, which often accompany nicotine withdrawal.

In some cases, a doctor may evaluate specific support pathways, including nicotine replacement therapies or other pharmacological tools.

Perhaps the most important aspect is avoiding the sense of failure.
Many people go through multiple attempts before successfully quitting for good. This doesn’t mean they aren’t capable, but rather that they are facing a complex biological and behavioral process.

Every daily choice (nutrition, movement, rest, stress management, and reducing addictions) converses with our DNA and helps build our health status over time.

Quitting smoking does not just mean eliminating an addiction.
It means investing every day in your own health, energy, and longevity.

WHO – Tobacco fact sheet

Centers for Disease Control and Prevention (CDC). Benefits of Quitting Smoking

Xie, Z., Rahman, I., Goniewicz, M. L., & Li, D. (2021). Perspectives on Epigenetics Alterations Associated with Smoking and Vaping. Function (Oxford, England), 2(3), zqab022.

Gould TJ. Epigenetic and long-term effects of nicotine on biology, behavior, and health.
Pharmacol Res. 2023;192:106741.

Centers for Disease Control and Prevention (CDC). How to Quit Smoking.