why does the author mention lisa's smoking scene several times? does this help to shape lisa's character

Smoking represents a personal flashback. Lisa smokes cigarettes and drifts off in various memories of her childhood and adolescence. The memories are often blended together in a non-linear way that makes the book less of a singular narrative than a stitching together of the various pivotal moments that have shaped Lisa's young life.Through these recollections, we become acquainted with Lisamarie's family.