This article is about smoke used as a security measure. For the Transformers character, see Smokescreen (Transformers). For military application, see Smoke screen.
Security smoke (sometimes called security fog or smoke screen) is thermally generated white smoke specifically used as a security measure. Current security smoke machines use glycol or glycerine mixed with distilled water to produce a dense white fog which obscures vision and presents a confrontational barrier to any intruders.
