chapman says it can be critical. you're basically saying that over a week's time, their lungs are failing. >> they go from healthy adolescents to really in a life- threatening situation. >> reporter: juul declined to comment on ammirata's case but says it's monitoring the ongoing investigation into the other lung injury cases. the american vaping association is taking the position that it's not nicotine but illegal drugs or t.h.c., an ingredient in marijuana, that likely caused those injuries, but norah, nobody really knows for sure. >> o'donnell: is the lung damage permanent? >> reporter: they don't know. they say there could be permanent lung damage. they're not sure yet. >> o'donnell: scary. anna werner, thank you so much. coming up, from tampa to key west, why florida's palm trees are slowly dying. i have heart disease, watch what i eat, take statins, but still struggle to lower my ldl bad cholesterol. which means a heart attack or stroke. could strike without warning,g y freryt that iren) because with high bad c