i don't even think the get them hooked on drugs and liquor to push them down the rabbit hole. alcohol and drugs are in part part of the lifestyle and in part used in order to numb the psychological stress of sex work. on top of that, you probably have a lot of people with a predisposition entering porn, since promiscuity is often self harming behavior, which goes hand in hand with other self harming behavior such as drug abuse.
what does happen though, is that some agents send performers to shoots without explicitly telling them the details of what they are expected to do. i saw a documentary once, where the agent said he deliberately sends his performers to a horrible shoot the first time they work, because after that shoot, everything else seems easy to them.