If you are inactive and not doing anything, they are not supposed to bother you. Back in the late 1990s, there was an inactive witless that had roughly 4 years of inactivity that was betting on football games. Someone tried to rat him out at work, and they did nothing. Bear in mind that they don't always abide by this--if the hounders feel like dragging you back in, they will do so anyways.
However, if you attempt to return to the cancer and continue doing things like this, you will be hauled before a judicial committee. I saw this happen once, when someone that had been inactive attempted a return, was still doing things, and got disfellowshipped. Which to me is the epitome of stupidity if you want them back.