I received a response back from Wrigley's and thought I would share it with you guys.
Dear Ms. HubbaDoo,
Thank you for writing to inquire about ingredients used in Wrigley products.
The amount of aspartame, or other high intensity sweetener, used per stick is extremely small, as they are only included as flavor enhancers. For example, it would take approximately 40 sticks of gum to equal the amount of aspartame in one can of diet soda.
Some Wrigley brands were improved to deliver the same flavor you have come to enjoy, with longer lasting power. With the change in packaging and the addition of the "Now Longer Lasting" tagline, a small amount of artificial sweetener was added to help with the longevity of the flavoring.
At this time, the following Wrigley products do not contain aspartame:
Of course, formulations can change from time to time, so please check the ingredient listing occasionally. We hope this information has been helpful. If you have any additional questions or comments feel free to contact us at 1-800-WRIGLEY Monday through Friday from 8:30 a.m. to 5:00 p.m. CST. Thank you again for reaching out to us.
Consumer Affairs Representative