Caffiene is no more 'scary' then any of these agents.
If you took 1000mg of caffiene at once you would probably suffer side effects that could possibly cause you harm.
Same as if you abuse any substance.
Smoking, overeating, big macs, sausage, playing compeitive sports(football, baseball, basketball, racing, hockey, boxing) NONE of these are healthy activities in fact that are probably quite detrimential to your overall health in many respects.
Healthy would be drinking water only, exercising while miniminzing injury(side effects), eating a well balanced diet, probably taking vitamins, seeing your doctor, avoiding risky activities. etc.
Fett. Alfredo scares me more than ephedrine using appropriately. or getting tackled in the knees playing football. In fact, the rewards outweigh the risks in diet suppression, fat burning and performance relative to exercise. Yes, but if you take 5 at one time and die and the media generalizes bad stuff well that's like walking out in the street in front of a semi.