And it's all about our friend - cocaine.
It has been said that during the recording of Sabbath's Vol. 4, the substances abuse issues were prevalent. Speakers full of cocaine were being delivered to the studio; massive amounts of drugs were being consumed daily while recording the music. Snowblind was intended to be the real title for what would eventually become Vol. 4, but the music execs mandated a change.
Also, I've never seen this personally, but in the liner notes of the album, Sabbath thanks "the great Coke-cola".
Here's a great performance from 1975. Hope you enjoy the music as much as I do.