Splitting hairs with regard to censoring various depictions of drug use in the media

Today I happened to turn on the television and come across a popular film that had been edited for content.  It struck me as rather asinine that the censors would approve showing a scene in which one actor was snorting cocaine; meanwhile, an entire segment of the film was completely cut out depicting another key actor shooting up heroin.  Really?  What's the difference?  It is almost painfully obvious that these petty distinctions are politically, racially, and socioeconomically motivated.  Apparently, quibbling like hypocrisy knows no bounds.