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The particulate matter found in the IQOS aerosol was volatile, which was especially noticeable when exposed to the electron beam of the scanning electron microscope (SEM) and Transmission Electron Microscope (TEM)

In between smokes, the onlooker added, Pitt was 'completely committed' to the cause, and was 'involved as much as or probably more than anyone else there.' Pitt recently spoke about moving on from the collapse of the five-year marriage to Angelina Jolie 'He was there between three and four hours and he would only stop every hour or so to have a quick three-minute break to smoke a cigarette and then he was back at it.' During his volunteer day he was also seen enjoying a modest fast food lunch, which he ate from a regular to-go container with a plastic knife and fork

Irritation caused by smoke may also cause eyes to red, but this is not a significant factor

Thun M, Peto R, Boreham J, Lopez AD