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Peak craving per day by treatment group during the 4 weeks prior to target quit day. EV = extended Varenicline; FE = facilitated extinction; SV = standard Varenicline; TQD = target quit date. TQD occurred on week 1 (W1), day 7 (D7). Varenicline was started on day 1 of week 4 for the EV and FE conditions and on day 1 of week 1 for the SV condition, as indicated by the arrows.
