I know a guy that takes 10-20 Vic's a day and about 10 Soma's.
He does it on cycle as well and it doesn't effect his gains, but we have both talked about the implications that he won't be alive in 5 years, or less, if he keeps this up.
The only problem I've seen is liver issues. You're already taxing your liver w/ the gear. Moderation, brotha... moderation.