Today I talked to someone around my age at the gym that ran a couple cycles of prohormones. They surprisingly opened up about it and had a similar opinion regarding the "addiction" it becomes. He's addicted to the gains on cycle, which is the only reason why he ran more.

As for side effects, he seemed to be pretty smart. Only thing he said that went "wrong" were some pretty serious acne breakouts on his back, but he was able to keep these under control with sun exposure and multiple baths (I think he used salt?).