A cargo plane packed with food and hygiene kits has left Miami for Cuba as part of the U.S. government’s humanitarian assistance efforts for the people of the island nation.

NEW YORK, NY Health officials acknowledged Friday they are still looking at a wide range of products and chemicals that could be causing the U.S. vaping illness outbreak. "We don't have a short list" of suspect substances, Mitch Zeller of the U.S. Food and Drug Administration told reporters Friday. But microscopic images may be pointing to another understanding of how vaping can disrupt the lungs' delicate balance. Of potential causes, so far "nothing lines up 100 percent," said Dr. Sean Callahan, a University of Utah Health lung specialist who has treated vaping illness patients. The number of new cases each week seems to be declining, but health officials say it's not clear whether the outbreak is leveling off.