Four years ago I had a mild heart attack. I had just smoked about a pack of cig's and a big fat joint and freaking over computer problems and fixing them. I now have stinth's on both side of my chest. I'm 47 now and don't smoke cig's since then. I still get the rush of anxiety from good weed but get used to the strain quick. The lack of oxygen in your blood does worse than the constriction of blood vessels. Paranoia is even worse. I am also battleing cronic pain. My doctor can't write a script for MJ and I am alergic to most all pain meds but he would rather I take care of pain my way. If you have doubts about your cardio vascular system then have it checked or quit now. I have smoked MJ since about 18 years of age. Stress causes more heart attack than most anything else but we seldom here of the many other thing a person is doing at the time. On one last note a study just showed that MJ can grow new brain cells in lab rats, almost unheard of. I'm about 2 big fat ones away from being an Einstien. LOL Just remember paranoia can destroy ya is not a joke. You can think yourself into a heart attack without the help of drugs. Be safe and don't do anything that you don't know what will happen. All drugs affect each of us different. Bruce Lee was known as hash eater so as to not affect his lungs and he could stop his heart just by thinking and meditating. This brought on an early death for him, so sad but a little known fact. I'm rambling now and the busted was because most of my friends are gone or dead from other than drug reasons and I grew for my self only to have my own nephew turn me in cause I would not sell to him so he could be a big shit with th cronic. I have not smoked in months and feel worse than ever. Life sucks sometimes but goes on.