Baseline measures
At baseline, participants were asked to complete an electronic questionnaire on their mobile phones. The questionnaire asked about the following: gender, age, the number of years smoking, monthly/weekly/daily smokers and the number of cigarettes typically smoked in this interval, lifetime number of quit attempts, cessation counselling experience, use of quit smoking helpline, and use of snus (which is a moist oral tobacco product which is common in Sweden, sometimes translated as 