There is not a heck of a lot of info in that report, was there? And still, if the only thing they (think) that they find is a greater chance of heart attacks, I will still take that over the myriad of side effects that are listed with virtually all pharmaceuticals. I don't think anyone anywhere is saying that large amounts of cannabis is totally benign. However, when compared to all the other substances out there (most of them legal), cannabis has far less "side effects" than virtually any substance on earth.
I can only speak for myself. I come from stock that has bad tickers--on both sides of the family. My dad died at 58 from a heart attack. Mom was 64. Had a sister die at 50. Have another sis that had a non fatal heart attack at 60. I have high blood pressure and do take medication for it. But, still going (relatively) strong at 65. My latest project is the total gutting of the basement bathroom and a complete rebuild.