CHAFF works against SEMI_ACTIVE_RADAR, ACTIVE_RADAR, RADIO_COMMAND guidance (bug found! radio command means that CPG move missile manually and only smoke make guidance impossible)
FLARE affects PASSIVE_INFRA_RED seekers
SMOKE GRANADE affects SEMI_ACTIVE_LASER, SEMI_ACTIVE_LASER_BEAM_RIDING, ACTIVE_LASER, WIRE_GUIDED
you have to use SMOKE GRANADES to avoid AGM-114K hit (only vehicle has them, I saw some scripts for that but not sure they still use it)
CHAFF will help with AGM-114K