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 smoking sign not permitted penalties permission denied prohibited butt button buttons cigar cigarette image inhale place poison press shape signage signs silhouette smoke smoking smoking-room symbol wood wooden ban banned disease forbidden kills lungs nicotine no smoke prohibit quit risk roadsign smokers stop tobacco cease smoking quit smoking aeroplane air aircraft aircraft cabin ceiling console airplane cabin cabin lights ceiling communicating communication console cooling interior no-smoking sign passenger passengers personal personal air personal light seat-belt sign travel travelers traveling travellers travelling cease death die kill lung stop tobacco roadsigns