Whiskey Rose

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

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

Behind the scenes
The original idea for this perk was that it would allow carrying 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. Which is reflected in her use of the perk. If whiskey is added to her inventory.