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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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[3] Multiple research studies have attempted to identify a causative organism, but aphthous stomatitis appears to be non-contagious, non-infectious, and not sexually transmissible

Interaction with medications : If you are taking some medications to treat mental health disorders, you might not be able to get your desired effects once you consume chewing tobacco