Nicotine activates receptors in the brain that release dopamine, the feel-good chemical that’s naturally lacking in ADHD brains. This is one (though not the only) reason that teens with ADHD are prone to nicotine addiction — smoking cigarettes and now using vaping devices, which increased in popularity a whopping 900% from 2011 to 2015. Learn why vaping is dangerous, how to identify signs of vape use, and figure out where your teen is hiding his or her vaping device.