bad trip vs downer

bad trip

noun
  • A psychedelic crisis, the undesirable dysphoric psychological effects during hallucinogenic drug use, most often fear, paranoia, and especially horrifying hallucinations 

downer

noun
  • A negative drug trip. 

  • A livestock animal that has collapsed. 

  • A form of industrial action in which workers down tools and refuse to work. 

  • Something or someone disagreeable, dispiriting or depressing; a killjoy. 

  • A drug that has depressant qualities. 

How often have the words bad trip and downer occurred in a corpus of books? (source: Google Ngram Viewer )