Volume 177 , 1 August 2017, Pages 228-236 Cigarette smoking is associated with amplified age-related volume loss in subcortical brain regions Author links open overlay panel Timothy C.Durazzoab Smokers showed greater age-related subcortical brain volume loss than non-smokers. In these adults, 22–70 years of age, older smokers showed the most volume loss. Subcortical white matter (WM), thalamus, cerebellar cortex, and corpus callosum were most affected. Higher cigarette pack-years related to smaller volumes in several subcortical regions. Magnetic resonance imaging studies of cigarette smoking-related effects on human brain structure have primarily employed voxel-based morphometry, and the most consistently reported finding was smaller volumes or lower density in anterior frontal regions and the insula. Much less is known about the effects of smoking on subcortical regions. We compared smokers and non-smokers on regional subcortical volumes, and predicted that smokers demonstrate greater age-related volume loss across subcortical regions than non-smokers. Non-smokers (n = 43) and smokers (n = 40), 22–70 years of age, completed a 4 T MRI study. Bilateral total subcortical lobar white matter (WM) and subcortical nuclei volumes were quantitated via FreeSurfer.
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18 (Xinhua) -- Tobacco companies have known for decades that without counseling "nicotine replacement therapy" or NTR, used by consumers to complement smoking, hardly helps smokers quit, according to a study out of the United States. What's more, American cigarette makers embraced NTR as a business opportunity. Combined with counseling, nicotine patches, gum, lozenges, inhalers or nasal sprays - together known as NRT - came into play in 1984 as prescription medicine. In 1996, at the urging of pharmaceutical companies, the U.S. Food and Drug Administration (FDA) allowed those products to be sold over-the-counter. The tobacco industry once viewed nicotine patches and gum as a threat to their cigarette sales. However, with formerly secret internal documents known as the "Tobacco Papers," dated between 1960 and 2010 from the seven major tobacco companies operating in the United States, researchers at the University of California, San Francisco, revealed that cigarette makers had started investing in alternative forms of nicotine delivery as early as the 1950s, but stopped short because people largely regarded nicotine as harmful, and such products might have attracted the attention of FDA regulators. Published this week in the American Journal of Public Health (AJPH), the study titled "Tobacco Industry Research on Nicotine Replacement Therapy: 'If Anyone Is Going to Take Away Our Business It Should Be Us'" found that in 1987, three years after FDA first approved nicotine gum as a quitting aid, the tide had turned on the public perception of nicotine; and that by 1992, the tobacco industry had determined that patches and gum by themselves do not help smokers quit. For more than a decade, the companies did not act on this knowledge out of fear of FDA regulation.