Risk of Heart Attack is Double for Daily E-Cigarette Users

https://docs.google.com/document/d/e/2PACX-1vRJxALwtryYd4oa39cwIwfnuGvtkcDoVrQBkPwWaeqWkcj08sxxdz7sWYi0sSMzsmSZRcXxi4E5c6jG/pub