The addictive component makes sense, does that mean men who are injured and produce less go through withdrawal? Or like men as they age? That sounds miserable.
I personally know of several early 20s guys who were between light and heavy cycles all under the supervision of doctors (or at least getting blood tested periodically).
All of them have renal issues, kidney issues, adrenal system issues, thyroid issues. Some have heart problems. Not one of them is unscathed.