Trends & Articles A U.S. Study Says Teens Who Vape May Have Higher Risk of Using Marijuana by Sophia Vida April 24, 2018 According to U.S. study, teenagers who use e-cigarettes may be twice as likely to smoke marijuana than their peers who have never used e-cigarettes. The study found that teenagers in the age range of 12 to 14 were 2.7 times mor...