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"It is a precautionary principle - until we do the studies and have a better idea of what the risks may or may not be, we should restrict their use in public places." Dr Kennedy also called for a ban on the use of the chemical diacetyl in e-cigarettes

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Private commercial locations with built-in, captive foot traffic warehouses, offices, hospitals, hotels, gyms, schools, and apartment buildings consistently outperform public locations

He says operators mostly look for colour codes and "unusual shapes"

ISBN 978-0-89820-124-6 via the Internet Archive