Epoxies are pretty innate as long as you don't get a run away exotherm. When they start to smoke they release some pretty nasty fumes. But otherwise, most regular indoor areas have sufficient ventilation so epoxies are fine to use indoors.
Polyesters contain styrene, so they can smell pretty bad. Still takes some high concentrations yo be really bad for you, but it's best to avoid using them indoors regardless.