Smoking Cessation

Nicotine dependence is what makes cigarettes hard to put down. Tobacco smoke delivers nicotine to the brain within seconds, along with thousands of other chemicals that damage the lungs, heart and blood vessels. Day to day it can feel like cravings within an hour of waking, restlessness when you go without, and a cough that never quite clears.

What nicotine dependence is, and what it is not

Nicotine dependence is recognised as a medical condition, not a personal failing. Regular nicotine changes the way the brain signals reward and stress, so going without produces real, physical withdrawal: irritability, poor concentration, disturbed sleep and a strong pull to smoke. That is the reason quitting is difficult for people who genuinely want to stop, and it is the reason treatment exists.

It is also not a single decision that either works or does not. Most people who stop smoking make several attempts first, and each attempt teaches you something about your own triggers and which supports help. Canadian survey data show how common that pattern is: among people who smoke daily, 31.4%, about 822,000 people, had made at least one quit attempt lasting a day or more in the past year. Quitting is not easy, and nothing here suggests otherwise.

Signs and symptoms

• Strong urges or cravings to smoke, especially in the first hour after waking
• Irritability, restlessness or anxiety when you go without cigarettes
• Trouble concentrating, and disturbed sleep, during withdrawal
• Increased appetite during withdrawal
• A cough that will not clear, or coughing up phlegm most mornings
• Getting short of breath more easily than you used to
• Wheezing, frequent chest infections, or a reduced sense of taste and smell

How strong these feel varies from person to person and from one attempt to the next. Withdrawal symptoms are usually at their worst in the first days and change over the following weeks.

What raises the risk

Some factors cannot be changed:

• Genetics, which affect how quickly the body processes nicotine
• Lower income and less access to cessation support, both of which are linked to higher smoking rates in Canada

Others can often be worked on, usually with support from a health care team:

• Starting to smoke young, and smoking more cigarettes per day
• Smoking soon after waking, which is a marker of stronger nicotine dependence
• Living or working around other people who smoke, and exposure to second-hand smoke
• Using alcohol or cannabis alongside tobacco, which makes quit attempts harder
• High stress, and living with depression, anxiety or a substance use disorder

How nicotine dependence is assessed in Canada

No laboratory test is needed. In Canadian primary care, providers ask about tobacco and vaping at visits, record how many cigarettes a day you smoke and how soon after waking the first one is, and use that to gauge dependence. Providers may also calculate pack-years, which combines packs per day with years smoked, because it is used to decide who is eligible for organised lung cancer screening programs in several provinces. Some clinics measure exhaled carbon monoxide, and a chest x-ray or a breathing test called spirometry may be arranged when there is a lasting cough or breathlessness.

Treatment and support for quitting

Clinical research for Smoking Cessation is enrolling. See the current studies ↓

Canadian care usually combines a medicine that reduces withdrawal with some form of counselling, and it treats a return to smoking as information rather than as failure. Depending on how much you smoke, what you have tried before and your other conditions, a health care team may discuss:

• Nicotine replacement therapy in patch, gum, lozenge, inhaler and spray forms, available without a prescription in Canada
• Prescription medicines including varenicline, bupropion and cytisine
• Behavioural support, including brief advice from a health provider, individual or group counselling, and self-help materials
• Provincial and territorial quitlines, text message programs and web-based programs, which are free across Canada
• Combined approaches that pair a medicine with counselling, followed up through family practice, pharmacy or hospital-based cessation programs

What works differs between people and between attempts, and there is no single route that fits everyone. Which combination to try, and when, is a decision for you and your own clinician or pharmacist.

When to talk to a doctor

• Call 911 for chest pain or pressure, sudden severe shortness of breath, or signs of stroke such as face drooping, arm weakness or trouble speaking.
• See your doctor promptly if you cough up blood, have a cough or hoarseness lasting more than three weeks, or are losing weight without trying.
• Support for quitting is available at any time from a family doctor, nurse practitioner or pharmacist, and provincial quitlines are free and do not need a referral.

Why clinical research matters for smoking and nicotine dependence

Most quit attempts do not last, returning to smoking after several months is common, and it is not yet clear how best to help people who have tried the existing treatments without success, or how vaping fits into cessation. Studies now recruiting are testing cytisinicline and other drugs acting on nicotinic receptors, nicotine vaccines and newer pharmacological targets, combinations and longer courses of nicotine replacement, and financial incentive programs. Researchers are also studying digital and text-based coaching, cessation built into lung cancer screening and surgical pathways, and approaches designed for people living with mental illness or substance use disorders, who have been under-served by standard programs.

Those approaches are tested in clinical studies before they become part of routine care. Taking part is voluntary, you give informed consent before anything begins, and you can stop at any time without affecting the care you get from your own doctor. Joining a study does not replace the quitting support you already have, and no one can say in advance whether a study will help you personally.

Learn more from Canadian sources

• Health Canada: provincial and territorial quit services
• Health Canada: Quit with Confidence
• Canadian Task Force on Preventive Health Care: smoking cessation recommendations
• Heart & Stroke