Drugs are 98-99%.
See Levrone, Flex, Arnold, Haney, etc... without drugs : there are totally normal.
From my experience.That is wrong.The most important thing is genetic and mentality.I saw many guys using gears like pros and smaller than me...what a shame!And some are real monster without drug.I dont think Ronnie get under 220pounds if he does without gears.THE DUDE HAS GENETIC.
And when those guys(Levrone,flex...etc) quit using staffs,
they dont eat and train also.But,even not trainning and eating,they are way musculer than normal guys. Beside,I saw several genetic monster
who dont lift and look like lifting. I heard that Vic Richard was that case also.