I treat it pretty realistically. I've had many family members who have struggled with both alcoholic and drug abuse.
On WL with Liz in particular she had her addiction that she hid from everyone but Kate who chose not to say anything about her drug use. When she overdosed, she then admitted herself to rehab. From there and this season she really reflects on her choices and then tries to move forward with her life, while avoiding her past addiction.
Some may consider that a little too public service announcement I guess, but I would rather tell the story right than not tell it at all. People abuse drugs, people hide their addiction and lie about it. An intervention of sorts is held and then that person either choses to get help or they don't. I would rather showcase the proper road to recovery and the steps it takes than to sweep it all under the rug, or worse turn it into a plot point.
Kelly
I really enjoyed Liz's problem. It was well-written. I hope you continue to make it realistic and have her back in a situation where she could fall off the wagon, as addicts rarely stay clean after their first trip to rehab/detox.