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The light beam (made of an incandescent bulb or infrared LED light that helps to collect the light source into a beam) in the smoke detector will reflect onto the photocells

Researchers at the Universities of Bristol and Cambridge wanted to see if the number of cigarettes in a single pack could help to reduce the number of cigarettes smoked, given smoking fewer cigarettes per day may increase the chances of quitting

This phenomenon, also called smokers lips, is caused by the tobacco inside of cigarettes

The researchers tested the participants' blood, saliva, urine and hair samples for cannabis biomarkers, and then asked six smokers and six nonsmokers to relax in a Plexiglas and aluminum smoke chamber about the size of a dorm room