★★★★★
In your research you are probably coming across tobacco. In fact, I tried tobacco first after reading the posts here on EC about worms and tobacco.
Here is my opinion about tobacco. Please don't use tobacco, especially standard tobacco because it contains pesticides and herbicides. I did (I used organic tobacco "American Spirit") and my cat turned into a mad cat for days and was attacking the other pets. I felt really bad for doing that to him.
Also, the tobacco will kill a bunch of worms at first and you'll think you got them all but, for whatever reason, the worms keep coming back. I even increased the amount of tobacco. Desperate, I went searching on the net as you are and a lady that runs a rescue told me about pumpkin seed oil. It is not over night but it is safe for your pet and I haven't seen a worm on Petie in months. (One bottle was just enough for Petie, but he was very thin. You might need two bottles if you have a heavier pet.) Make sure you order a 4 oz. dropper to go with the 4 oz. bottle. I ordered mine from Mountain Rose Herbs. They also have other natural items for pets.
Pumpkin Seeds
★★★★★