Thanks for reply and investigation. I double checked and found out that it was not hemp, but sorrel. I use both periodically and did not notice that it was sorrel instead of hemp, when I saw this effect. Sorry for misinformation, it's my mistake.
But I have a question: as far as I can see, the number of repetitions of effect seems unlimited, maybe it need some limit for repeats? Maybe 1 or 2 times after full saturation or per time period or something like? It's only suggestion. Now it looks like character can eat literally tons of food with appetizing herbal effects.