<qa>  What is the purpose of the SMART design?This study aims to identify effective Relapse Recovery RR treatments to assist smokers who relapse after an initial quit attempt. The study will use a sequential, multiple assignment, randomized trial SMART design with three phases. In a SMART design, randomization occurs at more than one stage, with randomization at a later stage based on response to treatment at an earlier stage. The three phases in this SMART study are as follows: 