Introduction

When a person chooses to quit using nicotine (from cigarettes, vaporisers or any other tobacco products), it often leads to several changes in both body and mind.¹ This process is called nicotine withdrawal and can be difficult and uncomfortable, especially during the few days after quitting.

Some common symptoms of this condition are a change in mood, irritability, anxiety, low motivation, low energy, difficulty sleeping and difficulty focusing. People can mention these changes after being nicotine-free for only a few hours.² Physical symptoms tend to decrease over time, but psychological or cognitive symptoms may have a longer impact and could affect one's daily life in ways that were not anticipated.

These psychological symptoms can be particularly demoralising for individuals quitting nicotine. Feeling irritable, low or foggy can be a real challenge and can complicate one's commitment to abstain and may heighten the interest in using nicotine again.³ This is why it is so important to understand what is taking place during withdrawal, and knowing that these symptoms are part of a temporary adjustment, meaning they are an important step in the recovery process.

Understanding nicotine withdrawal

Quitting nicotine has an impact on the body but also creates changes in the brain that can trigger a wide range of emotional and cognitive symptoms. To understand why this happens, it is worthwhile to briefly describe how nicotine works.

When someone uses nicotine, it interacts with specific receptors in the brain, triggering the release of chemicals like dopamine.⁴ Dopamine is a neurotransmitter involved with feelings of pleasure and reward. This is one reason why nicotine can seem to be calming or satisfying in the short term. However, if nicotine is taken regularly, the brain compensates and makes more of these receptors to achieve balance. Then, when nicotine is suddenly removed, that balance is disrupted, and the brain responds to the deprivation of this stimulation: that is the withdrawal.

Symptoms of withdrawal include cravings, restlessness, irritability, anxiety, low mood, sleep issues, headaches, tiredness and even problems in decision-making. Those symptoms tend to begin during the first 24 hours after quitting, peak at three days, and start fading after two weeks.⁵ While most of the physical discomfort tends to pass within a few weeks, the emotional and cognitive challenges can last longer.

Mood swings and emotional instability

One of the most difficult issues of quitting nicotine is not physical, but emotional. As the body starts getting adjusted to the absence of nicotine, many people tend to experience some intense mood changes. This can make the process be perceived as overwhelming.

Irritability and sudden frustration

It’s common to feel more easily frustrated or short-tempered in the early days of withdrawal.⁶ These reactions often show up within the first 24 hours after quitting and can peak around day three. Annoyances that normally wouldn't bother a patient can feel unmanageable. This happens because the brain, being deprived of nicotine, becomes more sensitive to stress. Those peaks of irritability will eventually ease, but having support and being prepared with calming strategies, like deep breathing exercises and short walks, can be helpful.

Anxiety and inner restlessness

Nicotine often acts as a temporary calming agent, so when it’s removed, feelings of anxiety can rise. Many people describe a sense of nervousness, muscle tension, or just feeling “on edge.” Trouble with concentration is also common.⁷ These symptoms can last for days or even weeks, especially for those who already live with anxiety. Activities that promote relaxation, such as gentle exercise, mindfulness, or speaking with a therapist, can help ease the tension and reduce discomfort.

Depression and loss of enjoyment

For some, withdrawal brings on feelings of sadness or emotional flatness: a state where things that once brought joy feel muted. This condition, known as anhedonia, is more than just a bad mood; it reflects a temporary change in how the brain processes reward.⁸ This factor can be discouraging, but it’s usually temporary. Supportive therapy, positive routines, and in some cases, medical treatment, can help bridge the gap until the brain rebalances.

Recognising that these emotional shifts are part of a larger healing process can offer reassurance. While the road may feel uneven at times, with the right strategies in place, it’s possible to regain emotional stability and build a healthier relationship with both the mind and the body.

Cognitive changes during withdrawal

Many individuals who are going through a withdrawal experience cognitive changes as difficulty with attention, memory, and reasoning. These changes can disrupt day-to-day life and make it challenging to remain abstinent from smoking.³

Struggling to focus

One of the most common complaints during withdrawal is the inability to focus. For some people, tasks that once felt routine (for example, reading, working, or even following a conversation) can feel mentally exhausting. Research suggests that nicotine has the potential to influence brain areas associated with attention and memory, so when nicotine use is stopped, those functions can temporarily slow down.¹ This situation usually tends to be at its peak in the first days, but for some people, it can persist for some weeks.

Decision-Making issues

Executive functions, which are the mental skills that help us plan, make decisions, and resist impulses, are also affected by withdrawal.⁹ Research using brain imaging suggests that individuals experiencing nicotine withdrawal may exhibit decreased activity in brain areas involved in these functions. Therefore, they may feel like they can be less organised, consider the consequences, or not be able to resist an urge in the moment. This situation can make quitting feel like an extremely difficult task, especially without proper support.

It’s important to mention that experiencing any of the struggles that were mentioned is not a sign of weakness, as they’re part of how the brain adjusts after nicotine dependence. With the right tools and strategies, it’s possible to manage these challenges and stay on track toward long-term recovery.

Psychological Outcomes

While withdrawal can bring emotional ups and downs, research shows that the long-term psychological benefits of quitting are significant and lasting.

Mental health benefits after quitting

Although many smokers believe that cigarettes help them cope with stress or anxiety, studies suggest the opposite. Giving up nicotine is linked to notable improvements in mental well-being.¹⁰ Research has found that people who quit smoking reported lower levels of anxiety and depression over time, even among those who had pre-existing mental health conditions.

Furthermore, the mental health-related improvements seen after quitting are similar to the effects of common antidepressant medications.¹¹ These findings challenge the myth that smoking is a form of emotional support, highlighting instead the emotional relief that can come with letting go of nicotine.

Why the first weeks matter

Despite these long-term gains, the early withdrawal phase can be emotionally difficult. Feelings of irritability, anxiety, and low mood are common; if left unaddressed, they can increase the risk of relapse. Studies have found that the intensity of these psychological symptoms, especially when combined with strong cravings, can predict who might return to smoking.³ This is why emotional support during the quitting process is so critical. Whether through therapy, support groups, or medication when needed, addressing these mental health hurdles can make a real difference in building a more stable and positive emotional foundation for the future.

Summary

Nicotine withdrawal goes beyond cravings: it can affect how a person feels, thinks, and functions daily. As nicotine leaves the body, it triggers a range of psychological symptoms, including mood swings, anxiety, sadness, and difficulties with focus or decision-making. These effects can start within hours of quitting and often peak during the first week. While physical discomfort usually fades within a few weeks, emotional and cognitive challenges may last longer, sometimes becoming the hardest part of quitting.

Despite these difficulties, quitting nicotine offers meaningful mental health benefits. Research shows that people who stop smoking often report lower levels of anxiety and depression in the long run, even those with prior mental health conditions. Recognising the emotional toll of withdrawal helps build realistic expectations and encourages proper support, especially during the early phase.

Understanding what happens during withdrawal and also knowing that these symptoms are part of a temporary adjustment can empower individuals struggling with this situation. With the right combination of emotional support, coping strategies, and professional care when needed, it’s entirely possible to overcome the psychological effects of nicotine withdrawal and move toward a healthier, more balanced life.