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Thus, if RR = (incidence rate exposed) (incidence rate unexposed) = I E /I 0 = 2, then AF E is given by (I E I 0 )/I E = (RR 1)/RR = (2 1)/2 = 0.5
If you have store-bought filter cigarettes around, and you don't want to smoke themor if you just want to practice rollingyou can carefully tear the paper and remove the filter

We always make it clear that some residues are not always easily accessible and that time constraints or cost factors may make source removal unfeasible
Alcohol and throat cancer: Why the combination with smoking is dangerous Combined use of alcohol and tobacco dramatically multiplies cancer risk compared to either habit alone

Each filter for cigarettes works up to 6 times, giving you consistent performance and better value while enjoying the same satisfaction from every drag