But that is not the only difference between the two stimulants, as the WKI researchers observed.
"In the e-cigarette, vaporised substances create an aerosol of ultrafine particles which become even finer when inhaled into the lungs. These tiny nanodroplets disperse over time," said Dr Tobias Schripp, scientist at Fraunhofer WKI and study co-author.
"Conversely, the combustion process discharges solid particles that can remain in the surrounding air for a considerable time," said Schripp.
