The tobacco method is supposed to work in a survival situation, if you have some with you. You’d have to be careful though, because if you eat too much tobacco, the nicotine will kill you too. I think 1-2 cigarrettes worth is the recommended amount for getting rid of the parasites.
My first experience with tobacco was eating (yes eating) half a bar of Days Work tobacco.
I don’t know if it killed any parasites, but I’m confident that my intestinal tract was as clean as a whistle the next day.