I definitely think a mental addiction is possible. true, I haven't done a cycle yet. but like all substances, if a reward from using is achieved (i.e. stoned from smoking, drunk from drinking and so forth) then the ability to gain muscle at a supraphysiological rate seems as though in itself that it could be addictive. Coke could be different, but I know plenty of people that hear the word coke and their mouths will water, even if someone is talkin about the soft drink. Just like all drugs. If you like the effects it brings, then you'll want to continue doing it, I've been reading these boards for a while, granted, its not nearly as long as some of the veterans here, but you know what I am sayin. I read about a lot of people planning their next cycle before their current cycle is even over...the wait must be horrendous. What the explanation for that? there must be some sort of want/need to do more. As for ronnie and other pros, their careers depend on their usage, so mental dependence is out of the question in that aspect.
But someone with some experience chime in, this is only what I think. not to be takin for truth...or experience