At the time of data collection, 300 participants (63%) smoked 100 or more cigarettes in their lifetime. Of these participants, 247 (82.3%) made at least one quit attempt in their lifetime and 112 (37.3%) were current smokers. Across the VETSA1 MRI sample, study participants had an average lifetime cigarette exposure of 27.5 pack-years. Current smokers had significantly higher levels of lifetime cigarette exposure (35.9 pack-years) compared to non-smokers (22.0 pack-years, p < 0.0001). Across the VETSA1 MRI sample, study participants smoked an average 21.5 cigarettes per day (SD = 13.5) during times of regular smoking. The average duration of smoking for this sample was 24.2 years (SD = 14.0). There were no significant differences in total intracranial volume, total surface area or average cortical thickness by current smoking status.
