Table 1 Inclusion and exclusion criteria for trial of nicotine replacement therapy.

Inclusion criteria	Exclusion criteria
Aged 14–20 years and able to consent	Age <12 or >20 years
Aged 12–14 and parental consent obtained	Aged 12–14, or aged 14 or over but not competent to consent, and parents unable or unwilling to give consent
Regular smoker: >1 cigarette per day (cpd) OR <1 cpd but past or anticipated withdrawal	Self‐reported non‐smoker
Carbon monoxide validation >5 ppm	Allergic to sticking plaster
No medical contraindications	Pregnant or risk of pregnancy