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Now, adults with depression are twice as likely to smoke as those without depression

"While e-cigarette vapor does not contain many of the toxic substances that are known to be present in cigarette smoke, it's still important for us to figure out and to minimize the potential dangers that are associated with e-cigarettes." Previous studies have found low levels of aldehydes, chemical compounds that can cause oxidative stress and cell damage, in e-cigarette "smoke." But until now, no one has looked for free radicals, the main source of oxidative stress from cigarette smoke