170 



Ceiilrr on <ddicLiuii 

 and Substance Abust^ 

 al Columbia University 



ATTACHMENT A 



• % of those using a given substance. 



*• Relative Risk is the irxxeased probability of using the substance 

 compared with those who never smoked. For example, a relative risk of 12 

 means that the smoker is 12 times more likely to use heroin than someone 

 who has never used cigarettes. 



**• Heavy smokers are individuals who smoke more than one pack a day. 



All data derived from National InstJtute of Drug Abuse (NIDA) National 

 Household Survey on Druge Abuse, 1991. 



[For addlional information contact Jeffrey C. Memll, Vice President and 

 Director of Policy Research and Analysis, 212-841-5240.] 



