May get heart damage. Smoking Cocaine can lead to coronary artery spasm and give your a heart attack. I have taken care of several coke addicts who had this problem and actually suffer real myocardial infarctions (heart attacks). Go see your doc asap.
Several reasons. Ok...Well crystal methamphetamine causes vasoconstriction. It also causes the heart to beat more rapidly. When both of these events happen less blood gets to the hearts coronary arteries for its own nourishment. This is called ischemia.