"Eric Nestler, at the University of Texas, has shown how addictions cause permanent changes in the brains of animals. A single dose of many addictive drugs will produce a protein, called delta FosB that accumulates in the neurons. Each time the drug is used, more delta FosB accumulates until it throws a genetic switch, affecting which genes are turned on or off. Flipping this switch causes changes that persist long after the drug is stopped, leading to irreversible damage to the brain’s dopamine system and rendering the animal far more prone to addiction. Non-drug addictions, such as running and sucrose drinking, also lead to the accumulation of deltaFosB and the same permanent changes in the dopamine system." (This is a quote from the "Your Brain on Porn" site.)
This talk about irreversible damage is really freaking me out. I thought it was possible to recover and return to normal functioning. It is possible isn't it?