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(KGO) -- A Sonoma County construction worker suffered third-degree burns on his leg after his e-cigarette's spare battery exploded in his pocket last month

Certain noncommercial and business-to-business shipments may be allowed under conditions detailed in USPS regulations, but those permissions do not apply to e-commerce shipments (other than those entirely within Alaska or Hawaii), USPS said in the statement

They all use activated carbon as the key filtering material, but the shape, size, and way you use them can be very different

Their widespread use did not begin out of concern for health, as many people thought