Where would golden-age TV be without drugs? Illicit substances have served shows almost like characters, each with its own circumstances and even personality: heroin in “The Wire,” meth in “Breaking Bad,” marijuana in “Weeds,” bootleg hooch in “Boardwalk Empire.” “Snowfall,” which begins Wednesday on FX, aims to write an origin story for crack cocaine, which… Read More Review: FX’s ‘Snowfall’ Dramatizes an Origin Story for Crack Cocaine