after studying (in school and on my own), expermenting and witnessing drug use , i can tell you that opiate-based pills (hydrocodone, oxycontin, vicodin, etc.) are the easiest to get hooked on .
once you arent high anymore you get an awful withdrawal which in turn makes u need the drug.
opiate pills (pain pills) also removes EMOTIONAL and PHYSICAL pain really well, so some people really like this feeling and become addicted.
benzos (anti-anxiety and anti-seizure prescription) ( Valium, Clonapin, Xanax , etc.) are also very enticing and hard to quit.
the withdrawal of benzodiazepines make people really anxious , moody and once in withdrawal predisposes you to death and seizures.
my uncle's addicted to klonapin, ive seen many times in withdrawal and it doesnt look fun at all. he shakes a whole lot.
i have tried clonapin, thk god i knew a lot about it be4 because if i had a source for it i prolly would have became addicted, since it helped my anxiety.
i have smoked opium, but never dared try any pain pills cuz i know you get really sick the day after and continually after using each time.
opiate withdrawal is just horrible.
prescription pills are not something to mess around with, they all have at least 10 different side effects, best to read about them first for your own safety and health.
check out wikipedia at least.
regards, take care