Snoop dogg and 50 cent are'nt stoners. I think the're more into it for the image. Snoops in alot of hightime mags but I think to be a stoner, you have to understand and respect herb. No one get mad,just my opinion, someone take the floor and prove me wrong actually.
Anyway, to your question. I totally think bob marley smoked like 1/4 Oz to a 2/4 Oz. Like Nick said its a big part of his religion (rastafarian, right?). Something ironic is that Bob Marley died for his religion. But we know how he lived BECAUSE of his religion.

For anyone who does'nt know, I beleive he got cancer in his toe which have been a simple routine (shitty though) operation to amputate his toe. But his religion would not allow it. So he was die-hard for his religion, and he was famous and made lots of superb music. (AND HE WAS AN AWESOME STONER)
So yeah, Bob Marley is truely a legend. BTW I talk ALOT when I'm burning out.