At that time, wasn't arsenic also in many 'remedies' and beauty products, as well as yellow and green wallpaper (I always thought the woman in "The Yellow Wallpaper" was suffering from poisoning)? This would have given them a certain resistance to it: if you take small doses of arsenic regularly, the lethal dose is higher. But there were many other possible poisons. James Tully, the writer of "The Crimes of Charlotte Bronte" thinks it was agrimony, if I remember correctly.
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