The psychology subject I think I'll remember most about five years from now would probably the various times we covered drug addiction. I never understood how or why people got addicted to drugs.
I thought it was really interesting how operant conditioning works in addiction and how taking a drug again escapes withdrawal and is thus maintained by negative reinforcement. It is also facinating how the body has a compensatory response to drugs and so users experience the opposite of what they were trying to experience by taking the drug.
I would say this is important to my life because I am planning on going into nursing and possibly public health nursing so I am sure that I will stumble on more than a few people who are addicted to drugs or were once addicted to drugs and dealing with the adverse health effects.