In prison Trump would be subjected to the same three meals a day as the other inmates.
But he would be able to purchase extra items, such as his beloved Diet Coke, from the commissary.
Mr Smith said the reality of the job as a Secret Service agent is “not always completely pleasant” and protection officers are only assigned for four to five years due to the difficult nature of the role.
“Everybody thinks about the agents and the dark suits and sunglasses with earpieces, but they don’t necessarily think about, you know, standing in the hallway of a hotel, or eight or 10 hours during the night while someone sleeps and that part of it is not very glamorous,” he said.
The agents he has spoken to have shown no “emotion” in response to the prospect.
“They’re all professionals, they understand that world events can change on a dime and they are ready to do whatever is necessary to protect the former president under the law,” he said.
Mr Smith did have some advice for any prospective agents who might be given such a task.
“I think I’d bring my own lunch. I wouldn’t want to eat in the cafeteria if I could avoid it,” he said.
A Secret Service spokesman said Thursday’s verdict had “no bearing on the manner in which the United States Secret Service carries out its protective mission.
“Our security measures will proceed unchanged,” he added.
New York’s Department of Corrections said it would “find appropriate housing for him [Trump] if he winds up in our custody”.