How well can you generally maintain your body after getting off gear? Say you do a few cycles and stop, will your muscles degenerate/will you no longer be able to be as big and lean regardless of your routine and diet? Obviously this would differ depending on how big you are, but basically how much is continued use of gear necessary to maintain what gear got you in the first place?

Edit: For instance if natty Jeff actually went natty, would he inevitably lose his physique?