Two new studies examined the neural systems of people addicted to smoking and found that their brains had highly variable reactions. "One study, published online by the journal Nature Neuroscience, found that people who had a stronger brain response in certain brain regions when getting individually tailored smoking-cessation messages were more likely to quit four months later. ... The second study, published in the journal Psychological Science, also used brain imaging to watch three specific brain regions known to affect inhibition of unwanted or habitual behavior."