Instant window smoke from Spawn 6 (left-side stairs, second row of spawns from back wall, in front of garbage bags)

Line up during the freezetime and hold down shift + left mouse button. When the round starts, tap W and jumpthrow.

See instant window smokes from other spawns:

• Spawn 1

• Spawn 2

• Spawn 3

• Spawn 4

• Spawn 5

• Spawn 6

• Spawn 7

• Spawn 8

• Spawn 9

Additionally here are more ways to smoke window from T Spawn.