The odds ratio for successful quitting for the e-cigarette group compared to subjects who used no cessation aid was 1.38 (95% confidence interval, 1.08-2.93).

(8) A statement that participation is voluntary, refusal to participate will involve no penalty or loss of benefits to which the subject is otherwise entitled, and the subject may discontinue participation at any time without penalty or loss of benefits to which the subject is otherwise entitled.

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