J.R. S. answered 02/10/18
Tutor
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
18 mg/3000 hits = 0.006 mg/hit
18 mg/200 cigs = 0.09 mg/cig
24 mg x 1 hit/0.006 mg = 4000 hits
24 mg x 1 cig/0.09 mg = 267 cigarettes