People wanting to lower their risk of developing cancer by taking aspirin need to take the over-the-counter medication "for at least five years", according to the scientist who established the link.
Professor Jack Cuzick told Good Morning Britain the five year timeframe was why it had taken researchers "so long to see" the health benefits.
More top news
Mack entered her plea in federal court in Brooklyn. The judge refused a request by her lawyers to release her without bail.
Officers investigating a reported break-in on Friday found 22-year-old Roger Alvarado asleep in the pop star's home in Tribeca.
Billy Jeeves is said to have fled the scene in Hither Green, south-east London, after Henry Vincent was fatally stabbed by the pensioner.