In the late 1800’s many Union and Confederate soldiers became addicted to morphine, stemming from of the usage of the beneficial pain-killing effect of the medicine.  Could this have set up our generation with an epigenetic predisposition for addiction to the drug?  Is the problem “nature” or “nurture” based?

The Interaction between Epigenetics, Nutrition and the Development of Cancer

Genetic switch involved with cancer metastasis