The research behind
the method.

At once

a lower limit must take effect, unless a technical failure prevents it

7 days

of follow-up, with fewer cigarettes smoked by the group taught urge surfing

126

high school students in the first field experiment

28.4%

of clients offered the locked account opened one, 202 of 710

11%

of smokers offered the contract signed up

2.2m

estimated daily VPN app users in the UK, up from 1.2 million before 25 July 2025

8.6%

of 2,325 US adults scored at or above a screening cut-off in a 2016 survey