There was a lot of social drinking and some hard drinking, particularly among officers. Officers had more privacy and disposable income. Whiskey, gin, beer, and wine were the favored drinks.  However, drunkeness was not tolerated in either Federal or Confederate camps.

Tobacco use was prevalent in both armies. It was not always available to the soldiers due to lack of money or a place to buy it. During periods of quiet along the front, Confederate and Union soldiers often exchanged items of value. Union soldiers swapped coffee with Confederate soldiers for tobacco.

A stranger would be smitten with the great number of mysterious men seen walking around with canteens by their sides and tin thimbles in their hands retailing pestilence at the rate of two dollars a jigger.
-Robert M. Gill, CSA,
16 Aug 1864.