News about nicotine addiction:
Researchers say they have identified brain cell receptors that appear to be responsible for nicotine addiction, a finding of clear importance for smokers who are desperately trying to kick the habit.
The receptors normally are activated by acetylcholine, a molecule that carries signals between nerve cells and has multiple functions in the body. A large number of acetylcholine receptors have been identified, each with subunits adapted for a specific function. Twelve of those receptors also are activated by nicotine.