However, states such as California, Nevada, and Colorado have exemptions for cannabis smoking in restaurants in their smokefree laws and Michigan has an exemption for cannabis smoking in restaurants and bars in its smokefree law
Thats why local governments have to act. So far at the state level, there's been a lot of political back-and-forth with little action
Available at: cdc.gov/tobacco/data_statistics/fact_sheets/smokeless/use_us/index.htm
1971 The Federal Trade Commission New York: Praeger Publishers Wakefield MA, Terry YM, Chaloupka FJ, Barker DC, Slater SJ, Clarke PI, Giovino GA
"Hawaii set to become first state to raise smoking age to 21"