Whiskey Rose

Whiskey Rose is a companion perk in Fallout: New Vegas gained while Rose of Sharon Cassidy is a companion.

Effects
The Whiskey Rose perk allows the Courier to consume alcohol 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 by 3 to 9 points, all based on the Courier's Survival skill.

Behind the scenes
The original idea for the perk was to allow the carrying of more water items or receiving a healing bonus from its consumption. This was later changed to reinforce Cass's hard-drinking personality and make her more valuable of a companion gameplay-wise.