A new study from the University of California Los Angeles (UCLA) in the United States found that healthy nonsmokers experienced higher levels of adrenaline in their heart after an e-cigarette with nicotine, but there were no higher levels of adrenaline when study subjects used a nicotine-free or empty e-cigarette. Unlike cigarettes, e-cigarettes do not have combustion or tobacco, but these portable electronic devices deliver nicotine with flavorings and other chemicals in a vapor instead of smoke. "Although e-cigarettes typically produce fewer carcinogens than those found in the tar of tobacco cigarette smoke, they also tend to deliver nicotine. Many believe that tar -- not nicotine -- is wh... [Read more]