An anonymous survey of college students was taken to determine behaviors regarding alcohol, cigarettes, and illegal drugs. The results were as follows:

820

drank alcohol regularly,

630

smoked cigarettes,

178

used illegal drugs,

389

drank alcohol regularly and smoked cigarettes,

101

drank alcohol regularly and used illegal drugs,

107

smoked cigarettes and used illegal drugs,

84

engaged in all three behaviors, and

335

engaged in none of these behaviors.