Every once in a while, Kotrina Lockard's cellphone buzzes with a text message -- a message of inspiration.
The first time, she read these words on the phone's screen: "Feeling light-hearted? You're not a ticking time bomb anymore. 20 mins after you quit smoking, blood pressure returns to normal."
Eight hours later, she got another message, informing her that her blood oxygen level would return to normal eight hours after she stopped smoking.
Lockard, 31, signed up for the text messages from the Rhode Island Department of Health in the hope they might help her quit smoking again. She'd been able to quit while pregnant, but resumed after her baby was born.