The National Institute on Drug Abuse annual survey found four in ten 19 to 30-year-olds are now puffing on cannabis every year, up a quarter from a decade ago.
Using cannabis can increase risk of developing an irregular heartbeat 74%, study finds dailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailymail.co.uk Daily Mail and Mail on Sunday newspapers.
Researchers say cannabis-infused gummies in brightly colored cartoon packaging appeal to youngsters and should face the same kinds of regulation as tobacco and alcohol.