Aerosol mass concentrations (mg/m3) for the detected metals spanned several orders of magnitude and exceeded current health-based limits in close to 50% or more of the samples for Cr, Mn, Ni, and Pb.
CONCLUSIONS:Our findings indicate that e-cigarettes are a potential source of exposure to toxic metals (Cr, Ni, and Pb), and to metals that are toxic when inhaled (Mn and Zn).
You do not even want to inhale E-cig sidestream vapors. Toxic levels of lead, chromium, manganese, nickel, and zinc - won't that kill you faster than cancer? image source(not recommended) top text mine