I am becoming pretty upset w/the ignorance here about speedballing or mixing uppers/downers, there seems to be a false belief that taking an upper and downer together stresses the heart. Well guess what?! That is not a real danger of speedballing. The heart during speedballing usually does not beat fast or slow. The two drugs nuetralizes the effect and the heart beats at a normal rate. Believe it or not. So how do people die on speedballs, heres an example. SNL comedian shoots a speedball. He deciedes that he doesnt really feel the dope that much and bangs somemore. Sniffs some coke, shoots alil more dope. 45 min later snl comedians coke high wears off. Unfortunate for him his heroin high is still going strong. So the coke crash and the fact that he just shot 2x the amount of dope that he can handle, under usual circumstances. Causes him to stop brathing. Now he's dead. In case u didnt get it, cocaine lasts about 30min(if your lucky),dope lasts a few hours. If u do too much dope while on coke, the coke wears off and u just did too much dope, your dead!. SO u see the effect on your heart is the least of your problems. THe more u speedball, the more chance of doing "this" and that makes u likely to die...Not your heart being stressed by an upper/+downer. I hope this clears things up.
Im NO greenlighter, my old id wont work! so RESPECT ME!