Quick cast is a characteristic of some abilities in League of Legends. This was previously called "smart cast" but was renamed by Riot in V3.12. Many players still refer to it as smart cast. All champion abilities can be set to quick cast using the in-game options screen.
Quick cast automatically casts the selected ability at (or towards) the current mouse cursor position, as if you had first pressed the ability button and then left-clicked at the target position. Quick cast works for self-buff abilities, targeted abilities, ground-targeted abilities and skillshots. Quick casting a support buff ability (an ability that can be cast on yourself e.g. a shield or a heal) when the cursor is on an invalid target will self-cast the ability instead. Note that you can use self-casting to self-cast support buff abilities regardless of cursor location. Using quick cast can be invaluable because it reduces the time delay between activating and casting by cutting the user input in half; activate vs activate and click.
Remember that quick casting means you don't get the targeting graphic, which can make it harder to accurately aim skillshots. They will fire instantly, instead of showing the hit box for fine tuning the shot. However, there is an option to turn range indicators on, which will show the targeting graphic while the ability key is pressed and fire when the key is released. This can also be helpful because the ability can then be canceled by right-clicking.
List of abilities that quick cast
The following abilities automatically employ quick cast:
Quick cast for special skill shots
Complex skill shots, such as vector skill shots like, and , can be quick cast by holding down the quick cast hotkey to mark the beginning of the line, and releasing the hotkey to cast.
Tapping the quick cast key normally will result in a straight forward skill shot fired in the same direction as the champion.
This method of quick cast was introduced in V22.214.171.124 to allow vector skill shots like to be used with quick cast.