Nicotine Use Disorder is a substance use disorder characterized by problematic patterns of nicotine use resulting in significant impairment or distress. It is associated with difficulty controlling nicotine consumption, continued use despite harmful consequences, craving, tolerance, and withdrawal symptoms when nicotine intake is reduced or stopped.

Nicotine dependence commonly develops through repeated exposure to nicotine-containing products including cigarettes, smokeless tobacco, and other nicotine delivery systems.

Epidemiology

• Tobacco and nicotine use disorders are among the leading preventable causes of disease and death worldwide

• Nicotine dependence contributes significantly to cardiovascular disease, respiratory diseases, cancers, and premature mortality

• Many individuals who use nicotine begin during adolescence or early adulthood

• Relapse after quitting is common due to the addictive nature of nicotine

Risk Factors

• Early initiation of tobacco or nicotine use

• Family history of nicotine dependence

• Genetic susceptibility

• Peer influence and social environment

• Stressful life events

• Coexisting mental health disorders including depression and anxiety

• Easy access to nicotine products

• History of substance use disorders

• Lack of social support during cessation attempts

Pathophysiology

Nicotine acts primarily on nicotinic acetylcholine receptors in the brain, stimulating dopamine release in the mesolimbic reward pathway. Repeated nicotine exposure results in neuroadaptation, increased receptor sensitivity, tolerance, and dependence. When nicotine intake is stopped, reduced stimulation of these pathways leads to withdrawal symptoms including irritability, anxiety, craving, sleep disturbance, and difficulty concentrating.

Clinical Presentation

Features of Nicotine Dependence

• Strong craving for nicotine

• Difficulty reducing or stopping nicotine use

• Continued use despite awareness of health risks

• Spending significant time obtaining or using nicotine products

• Using nicotine soon after waking

• Repeated unsuccessful quit attempts

• Continued use despite social, occupational, or medical consequences

Nicotine Withdrawal Symptoms

Symptoms usually begin within hours after stopping nicotine and may last several weeks.

• Restlessness

• Tremors

• Difficulty initiating or maintaining sleep

• Anxiety

• Irritability

• Low mood

• Difficulty concentrating

• Increased appetite or loss of appetite

• Strong nicotine cravings

• Reduced heart rate

Diagnostic Criteria (DSM-5)

Diagnosis requires a problematic pattern of nicotine use leading to clinically significant impairment or distress, with at least two of the following occurring within a 12-month period:

• Tobacco or nicotine is often taken in larger amounts or over a longer period than intended

• Persistent desire or unsuccessful efforts to cut down or control nicotine use

• A great deal of time is spent obtaining, using, or recovering from nicotine effects

• Craving or strong desire to use nicotine

• Continued nicotine use resulting in failure to fulfil major responsibilities

• Continued nicotine use despite social or interpersonal problems caused or worsened by nicotine

• Important activities are reduced or abandoned because of nicotine use

• Recurrent nicotine use despite knowledge of physical or psychological problems caused or worsened by nicotine

• Tolerance

• Withdrawal symptoms after reducing or stopping nicotine use

Differential Diagnosis

• Anxiety disorders

• Major depressive disorder

• Other substance use disorders

• Adjustment disorder

• Sleep disorders

Investigations

Nicotine Use Disorder is diagnosed clinically.

Assessment should include:

• Detailed history of nicotine use

• Type of nicotine product used

• Quantity and frequency of use

• Previous quit attempts

• Assessment of nicotine dependence severity

• Mental health assessment

• Assessment of alcohol and other substance use

Additional Assessment Tools

• Fagerström Test for Nicotine Dependence

• Tobacco use questionnaires

• Carbon monoxide breath testing where available

Management

Treatment Goals

• Achieve and maintain nicotine abstinence

• Reduce withdrawal symptoms

• Prevent relapse

• Improve physical health outcomes

• Provide long-term behavioural support

Non-Pharmacological Management

• Provide education regarding the health effects of nicotine use

• Encourage complete abstinence from nicotine products

• Offer behavioural counselling

• Provide motivational interviewing to enhance readiness to quit

• Encourage support groups that promote abstinence

• Provide structured smoking cessation programmes

• Consider inpatient rehabilitation programmes for individuals with severe dependence or repeated unsuccessful cessation attempts

• Identify and manage triggers associated with nicotine use

• Encourage healthy coping strategies including exercise and stress management

• Provide family and social support

Pharmacological Management

Pharmacological treatment may be considered for individuals with moderate to severe nicotine dependence or those experiencing significant withdrawal symptoms.

Nicotine Replacement Therapy (NRT)

Nicotine gum, patch, lozenge, or other approved nicotine replacement products may be used according to available national treatment protocols.

• Start therapy on the planned quit date or as clinically appropriate

• Adjust dose according to baseline nicotine use and withdrawal symptoms

• Gradually reduce nicotine replacement over time to achieve cessation

• Monitor for continued nicotine dependence and adverse effects

Other Pharmacological Options

Where available and appropriate:

Bupropion may be considered for smoking cessation, particularly in patients who require additional support.

Varenicline may be considered as an effective smoking cessation medicine where available.

Treatment selection should consider contraindications, comorbid conditions, availability, and local guidelines.

Referral Criteria

Refer to the next level of care if:

• Severe nicotine dependence with repeated unsuccessful quit attempts

• Severe withdrawal symptoms

• Significant psychiatric comorbidity

• Pregnancy requiring specialist cessation support

• Coexisting substance use disorders

• Need for inpatient rehabilitation

• Diagnostic uncertainty

Complications

• Chronic obstructive pulmonary disease

• Lung cancer and other tobacco-related cancers

• Cardiovascular disease

• Stroke

• Peripheral vascular disease

• Chronic respiratory symptoms

• Reduced quality of life

• Increased risk of other substance use disorders

Prevention

• Public education on harms of nicotine use

• Prevention of initiation among young people

• Tobacco control measures

• Screening for tobacco use during healthcare visits

• Early cessation support

• Restriction of access and marketing of tobacco products

Prognosis

Nicotine Use Disorder is a chronic relapsing condition. Successful cessation is more likely with combined behavioural support and pharmacological treatment when indicated. Repeated quit attempts are common, and ongoing support improves long-term abstinence.

Patient Education

• Nicotine dependence is a medical condition caused by changes in brain reward pathways

• Withdrawal symptoms are temporary and improve with time

• Stopping nicotine use reduces the risk of serious diseases

• Behavioural support increases the chance of successful quitting

• Avoid situations and triggers associated with nicotine use

• Seek support during cravings or relapse

• Do not stop prescribed cessation medicines without medical advice