Nausea/Vomiting

After reading many Liver-Flush stories, I feel some ppl do not have any trouble with nausea/vomit while others are very prone to getting one.
I am just wondering, does it happen to ppl who have a weak digestive system to start with. Wil doing a series of flushes, evntually make my body strong enough, so that I will not have nausea while performing a LF.
Any veteran flusher out here who used to have nausea before but not anymore.? And what causes vomit in first place?

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