Are you changing your routine up, or doing the same things over and over? If so it's like walking into a room that has a funny smell (like Red5's). But after a few minutes its not an issue. Body adapts the same way.
Now, I do go on cycles of and ECA stack (Ephedrine, Caffine, and asprin). I DO NOT RECCOMEND THIS FOR ANYONE.
Royal Dragon and I had this conversation a year or two ago. The Ephedrine is pure Ephedrine (well, with some guophensin sp?). I fully agree with taking hydroxycut off the shelves. Especially the one with Ephedrine in it.
I do take ECA stacks for about a six week cycle, then give it a break for a few weeks. However, I know exactly how my body reacts to it, and you have to work up to the recommened level. There was a study by harvard med school that backed up the findings that 25mg of ephedrine, 100 mg (i think) of caffine, and 75mg of aspirin are shown to increase metabolism and fat burning and had a definite advantage.
But the problem is that people would take it, and then go in the hot sun and exercise (primarily pro atheletes). That's where most of them that you heard about died. But most of those also were from hydroxycut or similair. You have to understand that the typical ECA stack raises your body temperature by approx. half a degree. That doesn't seem like much, but it also gets your heart beat going a bit harder. Bottom line, I do not recommend it for others, but if you do it, first do your homework.
Your intelligence is surpassed only by your ignorance.
You are more likely to fall down the stairs and break your neck if you live in a house with stairs. You are more likely to be in a car accident if you drive to work. You are more likely to be kicked in the nuts or punched in the nose if you practicing the martial arts. - Judge Pen