Evaluating specific plans to increase smoking quit attempts

INTERVENTION: Participants will be randomised to one of four groups: 1. To form a plan to help to quit smoking (active control) 2. To complete the volitional help sheet (active control) 3. To complete an 'if‐then' plan which includes a self‐incentive that can be used for each week that they have successfully quit smoking (intervention) 4. To complete an 'if‐then' plan which includes a self‐incentive that can be used for each month that they have successfully quit smoking (intervention) CONDITION: A psychological health intervention within a smoking population ; Mental and Behavioural Disorders PRIMARY OUTCOME: Increase in smoking quit status at six‐months post baseline (self‐reported) SECONDARY OUTCOME: 1. Increase in smoking quit status at the end of the trial (12 weeks after baseline); 2. Changes in nicotine dependence (using the Fagerstrom Test for Nicotine Dependence) at the end of the trial and 6 months post baseline; 3. Changes in smoking behaviour (using the Glover‐Nilsson Smoking Behavior Questionnaire) at the end of the trial and 6 months post baseline; 4. Changes in intention to quit smoking (using a three item scale taken from Armitage, 2008) at the end of the trial and 6 months post baseline; 5. Changes in self‐efficacy to quit smoking (using a three item scale taken from Armitage, 2008) at the end of the trial and 6 months post baseline; 6. Changes in self‐regulatory effort to quit smoking (using a six item scale taken from Armitage (2008) at the end of the trial and 6 months post baseline; 7. Frequency of self‐incentivising (using a measure adapted from Armitage, 2014) at the end of the trial and 6 months post baseline; 8. Kinds of self‐incentives used (using a measure adapted from Armitage, 2014) at the end of the trial and 6 months post baseline INCLUSION CRITERIA: 1. Aged 18 or over 2. Able to understand written and verbal English 3. Competent to provide informed consent 4. Attending one of the stop smoking services or workplaces currently involved in the trial