Probably a mixture of both
The majority of e-cigarettes on the market are illegal Unauthorized e-cigarettes, low in cost and high in nicotine concentration, are dominating the U.S
Other types of cancer : Tobacco use causes at least 15 different types of cancer, including cancer of the larynx, esophagus, mouth, throat, kidney, bladder, liver, pancreas, stomach, cervix, colon and rectum, and acute myeloid leukemia, according to an article titled, How does smoking cause cancer? from Cancer Research UK
This has especially worried experts like Erika Seward, the assistant vice president of national advocacy for the American Lung Association
The penalties are steep