Credit: Instagram

Most of the ladies in MTV's Teen Mom whack pack are model citizens and great role models, but even reality stars have their vices. A shocking number of Teen Moms smoke cigarettes despite the health risksand the fact that secondhand smoke is less than ideal for their children to inhale, but Kailyn Lowry isn't one of them!

"I do not smoke," Kailyn tweeted to a curious fan.

Good to know! Especially considering that some of Kailyn's closest Teen Mom buddies indulge in ciggies. Kail's co-stars Leah Messer and Jenelle Evans both suck on cigarettes like it's their job (though they've both given up the bad habit now that they're pregnant), and Teen Mom's OG mafia members Catelynn Lowell, Maci Bookout, and Tyler Baltierra have all been spotted with cigarettes hanging out of their mouths.

Tsk-Tsk, y'all! Hopefully these kiddos will take a leaf out of Kailyn's book of hard knocks and kick their habit! We'd hate for any of them to develop a smoker's voice.

Source: Twitter