Your heart rate and blood pressure drop.
Carbon monoxide in your blood drops to normal.
Your sense of taste and smell start to improve.
Your bronchial tubes relax and breathing gets easier.
Circulation improves and lung function increases.
Coughing and shortness of breath decrease.
Your risk of coronary heart disease is half that of a smoker.
Your stroke risk approaches that of a non-smoker.
Your risk of dying from lung cancer is about halved.
Sources: World Health Organization (WHO), CDC. Tar and nicotine figures are average per-cigarette estimates. This information is general and not medical advice.
If you vape
Your heart rate and blood pressure start to come down.
Nicotine in your blood has dropped to almost nothing.
Withdrawal is usually at its strongest around now. From here it gets easier.
Throat irritation and the cough some vapers get often start to ease.
Most withdrawal symptoms, like irritability, restlessness and poor sleep, have passed.
The nicotine receptors in your brain are back to normal levels, so cravings become rare.
Sources: NHS, CDC and Cosgrove et al. (2009). Research on vaping is younger than on smoking, so this timeline sticks to what is well established. General information, not medical advice.