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After decalcification, the tissues were dehydrated in a series of graded ethanol solutions and then embedded in paraffin

As far as cytotoxicity is concerned, there has been limited or no research clarifying the effect of e-cig exposure on cells from pulmonary fibroblasts, stem cells, and mouse neural stem cells

Also these are more economical and less waste than cartomiser or cartridge devices

It shows you how much money you have saved by not smoking, and how many cigarettes you did not light up

We found a weak but significant relationship between pack-years of current smoking and RR of breast cancer (Extended Data Fig