(IMAGE) McGill University Caption 2a: Never smoked versus current smokers - regions in yellow/orange are where those that never smoked have a thicker cortex than current smokers 2b: Ex-smokers versus current smokers - regions in yellow/orange are where ex-smokers have a thicker cortex than current smokers 2c: Never smoked versus ex-smokers - regions in orange are where those that never smoked have a thicker cortex than current smokers 2d: Mean cortical thickness across the whole brain for those that never smoked, ex-smokers, and current smokers Credit Credit: <i>Molecular Psychiatry</i>, S Karama, IJ Deary et al. Usage Restrictions Only in association with this study. Must cite credit information. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.