| Since they can be habit-forming, they should not be used for more than 2 to 3 days at a time. |
| He believed that chewing tobacco was not as habit-forming as smoking cigarettes and was unaware that chewing tobacco contains licorice. |
| An individual drug's schedule designation is determined primarily by its habit-forming properties. |
| In addition, many sleep aids can be habit-forming and eventually may interfere with restful sleep or even exacerbate insomnia. |
| These are substances that have helped to make cigarettes even more habit-forming than they would be without these substances. |
| Unlike many varieties of hard or soft drugs enjoyed by today's teenagers, weblogging isn't habit-forming. |
