Smoking Cessation
2 medicines
Smoking cessation is the process of quitting tobacco to cut the long-term health risks of smoking. Nicotine dependence makes quitting hard, but medicines like varenicline and bupropion substantially improve the odds of success.
Key facts
- Smoking cessation means stopping tobacco use for good. It is one of the most effective single steps for long-term health, at any age.
- Nicotine reshapes brain reward chemistry over time, so stopping causes real withdrawal: irritability, cravings, poor concentration, and disrupted sleep, usually peaking in the first two weeks and easing after a month.
- Medicines improve quit rates meaningfully. Varenicline and bupropion both reduce cravings, through different mechanisms, and sit within the wider addiction recovery medicine group.
- Combining medication with behavioural support gives the best chance of quitting for good.
Why quitting is harder than willpower alone
Nicotine binds to receptors in the brain's reward pathway, releasing dopamine with every cigarette. Over time the brain adapts, producing less dopamine on its own and coming to expect the nicotine hit. That adaptation is what makes early withdrawal so uncomfortable, and why quitting on willpower alone succeeds so rarely. Cravings, irritability, low mood, and trouble concentrating typically peak in the first one to two weeks and fade substantially within a month, but the psychological pull of habit and routine can persist longer.
How medicines help
Medicines that act on the same receptors change the odds significantly. Varenicline partially activates nicotine receptors, which blunts cravings while also blocking the rewarding hit of any cigarette smoked during a quit attempt. Bupropion, originally developed as an antidepressant (see antidepressants), reduces cravings and eases withdrawal-related low mood through a different mechanism. Both belong to the broader addiction recovery toolkit, and both work considerably better started with a firm quit date and combined with behavioural support such as counselling or a structured quit programme.
What to expect after quitting
The first two weeks are the hardest, with peak cravings and irritability. Sleep and concentration typically improve within a month, and the physical risk of heart disease and cancer starts falling from the first smoke-free weeks onward, continuing to drop for years afterward. Weight gain is common in early recovery and is usually modest and manageable with attention to diet and activity.
When to see a doctor
Talk to a doctor or pharmacist before starting a quitting medicine, especially if you have a history of depression, seizures, or heart disease, and if withdrawal symptoms or low mood become severe during a quit attempt.
This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.