This is true. Like many drugs, reactions can vary from person to person. Some people get euphoria, some people get dysphoria, some get nausea. Degree of pain control can vary, as some people perceive pain and its intensity differently from others. And some people have a greater tendency toward addiction than others. I can accurately spot the extremes at either end of the addiction-tendency scale, but there are a lot of people in the middle that can surprise even an experienced physician.
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