I do think that they can be addictive. I LOVE the feeling of being on. Not only great workouts but increased libido, and the sleep I get when on test is so refreshing and deep it is great. I think it is like anything; it can be taken overboard and get out of hand, and my OPINION is that these are the people that die of unusual issues such as heart attacks at age 35, or dieing on the football/baseball field, and they find 3 times the reccomended dosage of ephedra in your system in 100 degree weather, etc, etc. Using common sense and moderation they are great, but some people can't stop at that point and they head down the road of addiction in it's many disguises.