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Activated carbon filters - structure: There are now numerous manufacturers of activated carbon filters, which also makes it much harder to define the filter structure

Tobacco harm reduction: past history, current controversies and a proposed approach for the future

Dana Rohrabacher (R-CA) and Sam Farr (D-CA)

Also, laser settings must be chosen with precision

We opted for this approach to provide structure to the exercise: a completely organic sorting process, with participants collectively producing their own appealing and unappealing groups would have been time consuming and burdensome for participants in this particular study