After completing the retrospective questionnaires (CES-D, PANAS, and WSWS), EMG electrodes (Ag-AgCl) filled with saline gel were attached in the participant’s face to the right corrugator supercilii region using a bipolar configuration (Fridlund & Cacioppo, 1986). These COR EMG signals were acquired and amplified with a BIOPAC Systems’ (Goleta, CA) EMG100A Electromyogram Amplifier module attached to their MP100 system. COR EMG was filtered offline using 10 –500 Hz bandpass (Tassinary & Cacioppo, 2000) and 60 Hz notch. COR EMG was recorded at 1000 Hz and displayed using BIOPAC Systems’ AcqKnowledge III data acquisition software (version 3.5.3) installed on a Pentium III computer. Following sensor attachment, participants sat quietly for 5 minutes to allow for initial habituation to the environment. Zygomaticus major EMG, heart rate, and skin conductance were also collected, but were unresponsive to our smoking-related predictors and were not included in this manuscript.
