The bill would raise the smoking age to 21, and put 35 million dollars toward tobacco prevention and cessation each year.
Indiana State Police officials say they are preparing to enforce new laws that go into effect July 1.
Rates of drug use for marijuana declined, while over-the-counter drug use increased for some teens.
City officials say they don't think the suit will prevent the ban from taking effect Friday.
A comprehensive smoking ban in Indiana could save over $84 million in costs that currently go to treating smoking-related illnesses and complications.
Results of a new report show sales of tobacco to minors are down to an all-time low.
State lawmakers are debating a bill that would ban smoking in public places.