The potential of AB-free kava in enabling tobacco cessation via management of abstinence-related stress and insomnia: study protocol for a randomized clinical trial by Chengguo Xing, John Malaty, Melissa Bou Malham, Frank A. Orlando, Allison Lynch, Zhiguang Huo, Magda François, Roberto Firpi-Morell, Carla L. Fisher, Demetra D. Christou, Ramzi G. Salloum

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