In Margaret Atwood's novel "The Heart Goes Last," the character describes a person who has been a significant distraction in another's life, yet not essential to their existence. This comparison suggests that while the individual may have provided a fleeting intensity and excitement, like a powerful mint, their impact is temporary and ultimately not vital to the person's well-being.

This metaphor highlights the nature of some relationships where emotional highs can be exhilarating, but they do not sustain long-term importance or dependency. The imagery of a "super-strong mint" emphasizes how such fleeting experiences can be memorable yet transient, indicating a deeper commentary on human connections and their varying significance over time.