Poisoning is an influence from the environment, so its symptoms aren't necessarily connected to conflicts, but poisoning is actually a conflict on the physical/chemical level, like a chunk of waste.
Yet, depending on our state we can be more or less tolerant to poisoning. When our liver and lymphatics work well, we might not have the same level of symptoms. Like with alcohol, I have usually a much lower tolerance than Thorsten, but it depends a lot on the circumstances.
Here are some experiences I found on the net: [https://boards.straightdope.com/t/resistance-to-food-poisoning/452788|Resistance to food poisoning?]