Okay chest pain isn't good you know, cocaine is one of the most dangerous stims for your heart as it not only causes tachycardia (increased heart rate and therefore increased oxygen demand) but also significant vasoconstriction (reducing the blood supply and oxygen delivery) - recipe for a heart attack if you take enough. As with other stims it can also cause panic attacks and can make your chest feel ropy, but chest pain shouldn't be ignored. You should get that checked out really.. stay safe 

