Health investigators are casting a wide net to understand what is sickening hundreds of vapers across the United States and still have not ruled out any product on the market.
Researchers say universities across the United States have been slow to adopt anti-tobacco policies on campuses despite public health efforts to curb tobacco use, especially among teens and young adults.
San Francisco is the first major city in the United States to ban the sale of e-cigarettes as officials look to control the rapid uptick in teenage use of nicotine devices made by companies such as Juul Labs Inc.