5 cigarettes a day really bad Study: Light and Social Smoking Still Damages Your Lungs Every cigarette takes something away
Description
However, the particulate concentration in e-cigarette aerosol may be similar to that of tobacco cigarettes [3, 5, 6]
[107] Metals can originate from the "cartomizer" from the later-generation devices where an atomizer and cartridge are constructed into one unit

Public Health Consequences of E-cigarettes
We Can Make the Next Generation Tobacco-Free (Consumer Booklet)

Counotte DS, Spijker S, Van de Burgwal LH, et al