Open a window and get a solder fume extractor. Regular solder contains lead, and heating it up produces lead oxide fumes, which yields both short term and long term effects on your health.

While these two particular solders have the same flux cores, I don’t think you can make the argument that the flux fumes are the same, which is of course what counts. Lead-free fluxes typically ...

Inhaling toxic fumes containing Toluene hydrocarbon ... seizures and loss of consciousness and in fatal cases, it may even ...