https://www.gamespot.com/articles/fortnite-removes-another-weapon-heres-why/1100-6457430/

A new update is now available for Fortnite, which means players can now find some new items and content in both Battle Royale and Save the World modes. However, there's one weapon in particular that will no longer appear in the game--at least, for now.

Following Fortnite's 3.3 patch, smoke grenades have now been moved into the "Vault," effectively removing the item completely from Battle Royale. This doesn't necessarily mean that smoke grenades won't eventually return to the game, but for the time being, players will no longer be able to find them as loot during a match.