Whiskey Rose

Whiskey Rose is a companion perk in Fallout: New Vegas. It is given to the player whenever Rose of Sharon Cassidy is a companion.

Effect
The Whiskey Rose perk allows the player to consume alcoholic beverages without suffering any negative effects, including negative effects due to addiction. Additionally, consuming whiskey will raise the player's DT by 2 to 6 points and consuming wasteland tequila will raise the player's DT by 3 to 9 points, all based on the player's Survival skill.

Behind the scenes
The original idea for this perk was that you could carry more water items, along with receiving a healing bonus from its consumption. This was then changed to become more valuable as a companion game mechanic, and to also reinforce Cass's hard-drinking personality.