If this doesn't work, you can also quit Mac apps via the dock. To do this, hover over the app icon on the dock, right-click ...

Control-click on the program's icon to open a menu, then select Quit. Even if it takes a few seconds, the app in question should close like normal. If not, you may need to take more drastic measures.

In a new study, nearly half of participants quit vaping after completing a program that included phone-based coaching, a health app and nicotine replacement therapy. Top News .

If this doesn't work, you can also quit Mac apps via the dock. To do this, hover over the app icon on the dock, right-click on it, and select Quit.