I would agree to some extent here. Drugs don't equal genetics. However, when you are taking pro doses of mutliple things, it will drastically change any physique.
I'm surprised you haven't juiced since 03'. I would find it hard to train naturally, after cycling of a period of years. I'd say, most who juice, forever do. The difference in attaining gains is just night and day. Once most people are acustom to quicker greater gains, it's hard to go back.