Which of the following scenarios exemplifies extinction? alexis uses cocaine. she no longer feels quite the same rush as she did when she first started using. alexis is a former cocaine user in recovery. after a relapse, though, her hands shake and her heart pounds when she hears a car pull into her drive, like her dealer used to do in his car. alexis uses cocaine. she finds that she is slowly losing her sense of smell. alexis is a former cocaine user. now that she no longer uses cocaine, her hands no longer shake and her heart no longer pounds when she hears a car pull into her drive, like her dealer used to do in his car.