A pilot randomised controlled trial of abrupt versus gradual smoking cessation in combination with vaporised nicotine products for people receiving alcohol and other drug treatment

Background: Vaporised nicotine products (VNPs) may be a potential quit smoking strategy. Most research has permitted participants to use VNPs ad libitum. This is the first study to examine combining the use of a VNP with a gradual or abrupt cessation guideline. This study aims to test the potential feasibility of a quit smoking strategy (abrupt verses gradual cessation) in combination with vaporised nicotine products among people in AOD treatment. Methods: We conducted a pilot randomised controlled trial between April 2018 and July 2019. Participants were recruited from AOD programs located within one area health service in Australia. Participants were provided with two VNPs, a 12-week supply of nicotine e-liquid and randomised to either the abrupt (assigned a quit date the day they were provided their VNP) or gradual quit smoking strategy (reduce baseline number of cigarettes per day by 25% over a 4 week period), no further behavioral support was provided. Feasibility was assessed through successful recruitment rates, retention, and adherence to study conditions. Participant perceived helpfulness and satisfaction assessed acceptability. Results: Among 80 interested individuals, 66 were eligible and consented (100% recruitment rate). From the 66 participants that consented and completed the baseline survey, 60 received the intervention assigned at a 1:1 ratio with 30 in the gradual cessation and 30 in the abrupt cessation group. Retention was 86.4% (n = 52) at 12-weeks post-intervention commencement. Ninety-six percent (n = 25) of participants in the gradual and 95.8% (n = 23) of participants in the abrupt group were using the VNPs at 12-weeks (p = 0.66). There was no difference in adherence to the assigned quit plan between gradual cessation 44% (n = 11) and abrupt cessation 71% (n = 17) groups (p = 0.117). Median perceived helpfulness of VNPs was high for both gradual (10/10) and abrupt (9/10) groups (p = 0.813). Similarly, median perceived satisfaction of VNPs was high for both gradual (9 /10) and abrupt (8/10) groups (p = 0.414). Conclusions: AOD participants found an intervention that involved VNPs to be satisfying and helpful. Future large scale trials are needed to elucidate whether a gradual or abrupt cessation guideline is more beneficial in main a quit attempt with a VNP.