Smoking Machine (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption A new study at Berkeley Lab shows that ozone can react with the nicotine in secondhand tobacco smoke to form ultrafine particles that may become a bigger threat to asthma sufferers than nicotine itself. Credit Photo by Roy Kaltschmidt, Berkeley Lab Public Affairs Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.