True-False-Uncertain

If your answer is FALSE, explain WHY the statement is incorrect; if your answer is UNCERTAIN, explain under what circumstances the statement is true and under what circumstances the statement is false. If the statement is TRUE, simply mark it as TRUE, no explanation needed. Your explanations do not need to be lengthy!

1. Last week I was reading a novel and came across the following statement. "She lit a cigarette and dragged a lungful of sweet poison into her system. Like most pleasures, this one diminished the more you indulged it." The statement, which by the way is in an actual book that I'm reading, is an example of "the law of diminishing marginal returns,"