You have got to be kidding me, Nyquil contains acetaminophen(tylenol) and can kill your liver. Cough syrups is a catchall word, they use a shotgun approach to treat symptoms with numerous ingredients. You have to be super educated on what you are taking otc if you dont follow the recommended dosages. Drinking cough syrup can do several things, depending on the ingredients, most people just dont get medicine and what and how you think through it, cough syrup names the vehicle in which the molecules are administered. It can be a cough injection, that means you give a shot, but the crux of the issue is what is in the syringe and what does it do. Nyquil is like an injection of tylenol into your liver. There is an anaesthetic in the same class as ketamine that is an ingredient in *some* cough preparations called dxm. You can chug cough syrup and feel high or whatever and not have that ingredient in it etc...Its a really bad way and gross way to get that molecule and people fuck up and od on antihistamines, tylenol, all the other ingredients in cough preparations. Dont do it if you dont know what you are doing or have some explain what it is.
You can addicted to anything, seriously. If you are drinking Nyquil b/c of the dxm and are addicted to that it is wholly psychological b/c the neuropharmacokinetics of dxm is that it is a neuroprotectant but it is also an nmda antagonist so its used to treat alcoholism, cocaine abuse, heroin addiction. Its an antiaddiction drug that you are thinking that you are addicted to. If it causes problems in your life then you need to not do it, alcohol caused problems in my life so I quit using it. If its not causing problems in your life, why quit? Why switch to another? I mean you can get prescription dxm and other things. I mean what is it that you want to do. Get off that disgusting vile sludge called nyquil. That stuff is nasty, just a gross vehicle of ingestion
Now there is also preparations with Guafenisin and pseudoephedrine etc...
What ingredient are you trying to kick??