Heavy metals and rare earth elements source-sink in some Egyptian cigarettes as determined by neutron activation analysis. 
Heavy metals and rare earth elements in two types of cigarettes were studied.  The contents of trace elements were determined by using delayed neutron activation analysis.  In the present study 11 elements have been detected in popular and fine brand cigarettes marketed in Egypt.  Evaluation of these elements with their potential hazards for smokers is briefly discussed.  The material balance (source and sink) for each element was determined.  Also the ratio of element recovery to the total amount was assessed.