title: E-cigs: a threat to the heart.  Questions remain about this popular product.
mesh_terms: D001294:Attitude to Health; D002318:Cardiovascular Diseases / Q000209:etiology / Q000517:prevention & control*; D003257:Consumer Product Safety; D055615:Electrical Equipment and Supplies / Q000009:adverse effects* / Q000706:statistics & numerical data; D006801:Humans; D012907:Smoking / Q000009:adverse effects*; D062789:Tobacco Products / Q000009:adverse effects*; D014481:United States