Forgive this crude diagram
Is this allowed in the US?
Can I use the white and black wires of a ROMEX wire as the two ends of black wire to the switch and take the white (in red) wire to the terminal of the recessed light and in the metal junction box of the recessed light twist the black wires together using a wire twist on.
Otherwise, I would have to run 2 romex pairs to the switch and twist the white wires together there. This was would seem to save me some ROMEX.