Which word would best describe someone who exhibits a strong attraction to a specific activity or subject?

The term "penchant" is particularly apt in this context as it indicates a strong and often habitual liking for something. When someone exhibits a penchant for a specific activity or subject, it suggests not only an attraction but also a degree of preference or inclination toward it. This word captures the essence of a devoted engagement without the extreme implications of being overly fixated.

In contrast, "adoration" tends to imply a deep love or reverence, which may not strictly relate to an attraction to an activity or subject. Similarly, "fondness" suggests a mild liking or affection rather than a strong attraction. "Obsession" conveys an intense, often unhealthy fixation that goes beyond mere attraction, indicating a preoccupation that may interfere with other aspects of life. Thus, "penchant" accurately describes a strong attraction while maintaining a neutral or positive connotation.