area cigarettes danger direction environment health health risk no smoking no smoking in this area sign not allowed pollution prohibition sign unhealthy warning appropriate behavior appropriate behaviour no spitting not permitted penalties permission denied prohibited spit spitting no smoking sign alert appropriate-behavior appropriate-behaviour communicating communication health-risk no-smoking not-allowed not-permitted permission-denied angel of death Cg artwork death fictional character fire flame frightening graphic design graphics health warning heat horror illustration night smoke smoking smoking causes cancer smoking destroys health smoking kills expectorate expectorating historic-sign no-spitting old railway-platform appreciated black red symbols thanks white black-&-white gray grey greyscale advice announcement be-careful beware care caution concern consumption dangerous faucet informing listen Look looking lookout protect protection risk risks risky rules safety signs tap undrinkable warning-sign water