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You can also call the free National Smokefree Helpline at 0300 123 1044 (available in England)

The original silver nitrate film has been transferred to video, silent and jerky

There are several options available that can keep you connected on the go

Each type of detector responds differently to various airborne particles, which is crucial when considering how vapour from e-cigarettes might affect them, and photoelectric detectors are more likely than ionization alarms to react to e-cigarette vapor

Ethics declarations Ethics approval and consent to participatess Ethical approval for the STS was granted originally by the UCL Ethics Committee (ID 0498/001)