In Oblivion and Morrowind, Skooma was a very dangerous substance that damaged intelligence while increasing movement speed. For that reason, skooma was banned across much of Tamriel. However, in Skyrim, skooma remains banned as a dangerous substance, but it has no drawbacks and regenerates a small amount of stamina. This confused me while initially playing the game. Therefore, this mod aims to restore the dangerous effects of skooma so that it fits within the lore.

After loading this mod, skooma will cause blurry vision and a stagger effect while removing all your magicka and causing the player to be weak to magic. Skooma will also give virtually unlimited stamina regeneration for 20 seconds.

EDIT #1: Withdrawal symptoms have been added. This slightly lowers stamina regeneration temporarily after use.

EDIT #2: Added a temporary movement speed boost of 25%.

EDIT #3: By popular demand, Khajiit players do not get withdrawal symtoms. However, all other negative effects remain.

EDIT #4: Skooma and Double-Distilled Skooma are now craftable at a cooking pot. 

Note: There are three kinds of skooma in Skyrim: skooma, double-distilled skooma, and triple-distilled skooma. All have been modified to have dangerous effects. The latter two types are very rare in-game (only a few in all of Skyrim), and they have progressively stronger stamina-boosting effects with greater dangerous effects and withdrawal symptoms.
This mod does NOT require Dawnguard, Hearthfire, or any other mod.