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Are the fumes from (soldering) flux harmful?

To go along with the question on solder types, what about the fumes created from the flux? Most of the smoke you see while soldering is the flux burning away. Is that smoke or the fumes included in it harmful? Let me know what you think below.

Poll Results
  • Yes (82%)
    18/22
  • No (0%)
    0/22
  • I don’t know! (18%)
    4/22

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