Small quality of life/buff for him. When he presses E and sets where he wants to smoke show it on the map. This could be very beneficial at the round start when everyone is getting ready so everyone knows where he plans to place them in advance and adjust accordingly.

Round starts, Brim places smokes and they show on the map. Players now know if they should rush and take advantage of it or if hes blocking a line of sight that everyone can take advantage of before the round starts.