Marijuana may cause heart problems in young adultsBy Kerry Sheridan | AFP – 14 hours agoYoung adults who smoke marijuana may be at risk for serious or even fatal heart problems, according to a study by French researchers on Wednesday.The findings in the Journal of the American Heart Association raises new concerns about the safety of marijuana, just as many parts of the world are relaxing laws on its use and medicinal marijuana is gaining popularity for treating certain health conditions.The risk of heart complications appeared small in the study, which included nearly 2,000 people who More >