Hadn't thought about it that way, I got a GG4 clone 5 years ago and I assumed I got ripped off. It was a scrag, small weak flowers and went hermie. Had a couple other clones from clone dudes in the grow, I figured their strains were shitty. My real stuff kicked butt, I wonder if dud is a real thing or just shitty run-down clones. I don't need to find out the truth because I start my own stock from seed or get clones from growers I know..
It seems to be a real thing, and according to Dark Heart, it can even be passed on through seed, albeit to a small %.