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It is playing with fire to combine mouthpiece buzzing with the operation of a motor vehicle.
This kind of activity interferes with the more important task of eating and driving.
K.

Ah yes, but, it is illegal unless you are using a hands free device.
Perhaps a chin strap for the mouthpiece, made of industrial duct tape, sticky on both sides, wrapped around the whole head also?

Yeah, I think it'll fit beside the Jake and Bell statues.