Sentence:  Tanya shook her head slowly. 'We married to fill out the missing bits of ourselves. That doesn't have to be a bad reason. But you see, I'd "been" "in it". The contrast between that infernal blaze of feeling and keep-the-home-fires burning was just too much. It's why one mustn't start taking <WSD>Lucy</WSD>.' <WSD>Lucy</WSD> was the current slang for LSD. 
Meaning of the word marked with <WSD> tags:  The drug LSD.