The 20-year-old singer said Jonas, 24, was not forced into smoking weed by them, reported the New York Times.
"If you want to smoke weed, you're going to smoke weed. There's nothing that two little girls are going to get you to do that you don't want to do," Cyrus said.
"We were so young that it's actually like, 'How did you get peer pressured by me?'," she added.
In an essay, Jonas opened up about smoking weed with the young Hollywood stars and other personal topics.
"Love you brother. #family/friendsforver," she had tweeted at that time.