I'm +4 allergic to formaldehyde and anything that turns into it in or on the body (its in hair products and cosmetics) and have to monitor everything I use including construction and decorating materials (paneling/cupboards/cloth. Tiny amounts can cause severe problems for me. I have had no reactions to ejuices and have been vaping for almost a year. Actually I find it quite odd when I hear its in smokes. Maybe it was the major reason for all the congestion when I smoked?
Actually, German researchers found very tiny amounts of formaldehyde (18 micrograms per cubic meter) when they collected exhaled vapor in an 8 cubic meter emission chamber. With a conventional cigarette, they measured 86 micrograms per cubic meter.
They were surprised to find no nicotine and very little propylene glycol, so they redid the testing having subjects exhale into a smaller (10 Liter) container, to get more concentrated exhaled vapor. In this second case, they found much higher amounts of PG (up to 175,000 mcg / m3, compared to <1 mcg / m3 in the large chamber) and also detected a small quantity of nicotine (a high of 7 mcg / m3).
It's interesting that the formaldehyde was actually lower in the small container test -- <2 mcg / m3 on all vapors tested.
The authors commented:
However, continuous monitoring only showed a slight increase of the formaldehyde concentration in the 8 m³ emission test chamber before and during consumption of the three liquids (see Table 4 and Figure 2). This might be caused by the person in the chamber itself, because people are known to exhale formaldehyde in low amounts (Riess, 2010) and the increase was already observed during the conditioning phase (Figure 2). Furthermore, the release of formaldehyde was also below the limit of detection in the small-scale experiments.
Schripp T, Markewitz D, Uhde E, Salthammer T. Does e-cigarette consumption cause passive vaping? Indoor Air. 2012 Jun 2.
Does e-cigarette consumption cause passive vaping? [Indoor Air. 2013] - PubMed - NCBI