speedball danger

So I went on a 24 hour speedball binge and it was fucking incredible. But I've had a slight pain in my chest ever since. Just how bad is shooting coke. It's weird I normally find the high of shooting coke fucking disgusting and that keeps me from doing it but coke and dope seem to remove the negative side effects of each.

A friend of mind was shooting $100 of coke a night for a few months and ended up going to the ER because some part of his heart was inflamed or infected? They actually told him they couldn't say for sure it was from doing the coke in the past but it probably didn't help. Thinkin I should just stick to dope or snorting coke only. Or smoke crack with dope?

Also, my method was doing a little bit of C+D each time. I'd cook the shot of dope, let it cool, they sprinkle in about a bump or line of coke and pulling through cotton swab. Used a 20 of coke and 2 bags of dope over this approximately 24 hour period. Figured this is about the safest you can get for speedballs after a wheel filter. I remember reading and hearing from people you're not supposed to cook coke when you shoot it and can actually make it more toxic?