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 Damage Threshold (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.