My friend started snorting ephedrine (ephedrine sulfate). he's snorting the 8 mg pills. i'm concerned. can this harm him?

Yes: Though the dosage isn't high, side effects associated with ephedrine (ephedrine sulfate) abuse still apply. Anorexia, rapid heart rate, stroke, etc. I would be concerned since the abuse of medications which increase alertness, energy, weight loss are known to accelerate, requiring larger doses which increase the risk of side effects, including death.

This is a serious: problem and he is harming himself.