Background
There are 1.14 billion tobacco smokers globally, with 7.41 trillion cigarette-equivalents being consumed annually [Data from the Public Health Agency in Sweden showed that in 2021 [Digital interventions may contribute to the societal response to reduce the prevalence of smoking. These interventions are characterised by delivering cessation support materials using text messages, e-mail, mobile phone apps, etc. Text messaging-based interventions are particularly important since they rely on standard technology, which is increasingly prevalent globally, and can be delivered at relatively low cost. This means that they may be able to reach further into the community than face-to-face interventions. Early trials of text messaging-based interventions showed promising results, notably the txt2stop trial (In Sweden, there have been two trials of text messaging interventions. Both have targeted younger individuals in well-defined settings: the first amongst college and university students [