1 2455 191 YOGA AS A COMPLEMENTARY THERAPY FOR SMOKING CESSATION: RESULTS FROM BREATHEASY, A RANDOMIZED CLINICAL TRIAL. INTRODUCTION: THERE IS EVIDENCE THAT YOGA MAY BE HELPFUL AS AN AID FOR SMOKING CESSATION. YOGA HAS BEEN SHOWN TO REDUCE STRESS AND NEGATIVE MOOD AND MAY AID WEIGHT CONTROL, ALL OF WHICH HAVE PROVEN TO BE BARRIERS TO QUITTING SMOKING. THIS STUDY IS THE FIRST RIGOROUS, RANDOMIZED CLINICAL TRIAL OF YOGA AS A COMPLEMENTARY THERAPY FOR SMOKERS ATTEMPTING TO QUIT. METHODS: ADULT SMOKERS (N = 227; 55.5% WOMEN) WERE RANDOMIZED TO AN 8-WEEK PROGRAM OF COGNITIVE-BEHAVIORAL SMOKING CESSATION AND EITHER TWICE-WEEKLY IYENGAR YOGA OR GENERAL WELLNESS CLASSES (CONTROL). ASSESSMENTS INCLUDED COTININE-VERIFIED 7-DAY POINT PREVALENCE ABSTINENCE AT WEEK 8, 3-MONTH, AND 6-MONTH FOLLOW-UPS. RESULTS: AT BASELINE, PARTICIPANTS' MEAN AGE WAS 46.2 (SD = 12.0) YEARS AND SMOKING RATE WAS 17.3 (SD = 7.6) CIGARETTES/DAY. LONGITUDINALLY ADJUSTED MODELS OF ABSTINENCE OUTCOMES DEMONSTRATED SIGNIFICANT GROUP EFFECTS FAVORING YOGA. YOGA PARTICIPANTS HAD 37% GREATER ODDS OF ACHIEVING ABSTINENCE THAN WELLNESS PARTICIPANTS AT THE END OF TREATMENT (EOT). LOWER BASELINE SMOKING RATES (/=60 YEARS WITH SYMPTOMS OF WORRY. PARTICIPANTS REPORTED THEIR INTERVENTION PREFERENCE, STRENGTH OF PREFERENCE, AND FACTORS IMPACTING PREFERENCE. ENGAGEMENT IN THE INTERVENTION (SESSION COMPLETION AND DROPOUT RATES) WAS ASSESSED. PROCESS MEASURES INCLUDED SATISFACTION WITH THE INTERVENTION, THERAPEUTIC ALLIANCE, AND INTERVENTION EXPECTANCY. NEITHER INTERVENTION PREFERENCE (48% AND 52% CHOSE CBT AND YOGA, RESPECTIVELY) NOR STRENGTH OF PREFERENCE DIFFERED SIGNIFICANTLY BETWEEN THE TWO PREFERENCE TRIAL GROUPS. INTERVENTION EXPECTANCIES AT BASELINE AMONG THOSE IN THE PREFERENCE TRIAL WERE APPROXIMATELY 4.5 UNITS (40-POINT SCALE) HIGHER FOR THEIR PREFERRED INTERVENTION (P < .0001 WITHIN EACH GROUP). A PRINCIPAL COMPONENT ANALYSIS OF FACTORS INFLUENCING PREFERENCE IDENTIFIED THREE CONSTRUCTS. USING LOGISTIC REGRESSION, COMPONENTS FOCUSED ON ATTITUDES ABOUT CBT OR YOGA WERE PREDICTIVE OF ULTIMATE PREFERENCE (ODDS RATIO = 11.5, 95% C.I.6.3-21.0 PER 1SD DIFFERENCE IN COMPONENT 1 FOR CHOOSING CBT; ODDS RATIO = 7.8, 95% CI4.3-13.9 PER 1SD DIFFERENCE IN COMPONENT 2 FOR CHOOSING YOGA). THERE WERE NO SIGNIFICANT DIFFERENCES BETWEEN THE RANDOMIZED AND PREFERENCE TRIALS ON INTERVENTION ADHERENCE, COMPLETION OF ASSESSMENTS, INTERVENTION SATISFACTION, OR WORKING ALLIANCE. RECEIVING A PREFERRED TREATMENT HAD NO SIGNIFICANT EFFECTS ON INTERVENTION OUTCOMES THROUGH PARTICIPANT ENGAGEMENT OR PROCESS MEASURES. WHEN OPTIONS ARE LIMITED, PROVIDERS MAY HAVE CONFIDENCE IN OFFERING THE MOST READILY AVAILABLE NON-PHARMACOLOGICAL TREATMENTS. 2021