Clean Indoor Air Acts: State Bans, Federal Rules, and Exemptions

Clean indoor air acts are the state and federal laws that prohibit smoking in indoor workplaces, restaurants, bars, and other shared spaces, with many now extending to electronic cigarettes and cannabis. As of mid-2024, 28 states plus the District of Columbia and several U.S. territories ban smoking in all indoor workplaces, restaurants, and bars, while other states apply partial restrictions.¹ Federal rules add a baseline for aircraft, federal buildings, and public housing. What is actually banned, where, and for whom varies more than most people assume.

Where State Smoking Bans Apply

State smoke-free laws generally target enclosed indoor spaces where the public gathers or employees work. The statutory definition of “enclosed” usually means any space with a floor, ceiling, and walls or windows on all sides. That reaches government offices, hospitals, schools, restaurants, bars, retail stores, professional offices, and public transportation.

Coverage is not uniform. Some states ban smoking in workplaces and restaurants but exclude bars; others cover all three. The 28 states with the broadest laws prohibit smoking in every private-sector workplace, restaurant, and bar statewide.¹

Multi-unit housing is a growing area of regulation. Roughly 15 states restrict or ban smoking in common areas of government-funded housing, and about a dozen extend those restrictions to privately owned apartment buildings and condominiums.² Many jurisdictions also set outdoor buffer zones near building entrances so smoke doesn’t drift inside. The required distance differs by state: 15 feet in some, 20 or 25 in others.

Vehicles With Children

Twelve states separately prohibit smoking inside a vehicle when a child is present. Age thresholds range from 8 to 18 depending on the state, and several U.S. territories have similar rules.³ These statutes apply to personal vehicles, not only public transportation, and are enforced independently of indoor air laws.

Tribal Land

State smoke-free laws do not apply on tribal sovereign land. Tribal nations set their own policies for casinos, government buildings, and other facilities on their territory. More than 150 tribal casinos voluntarily adopted smoke-free indoor air policies during the COVID-19 pandemic, though not all have kept them. On tribal land, the tribe’s policy governs, not the state’s.

Federal Rules That Apply Everywhere

Several federal rules create a baseline that applies regardless of state law.

Commercial Flights

Federal law prohibits smoking on all scheduled passenger flights, domestic and international. For charter flights, the ban applies whenever a flight attendant is a required crew member. The statute treats electronic cigarettes the same as traditional smoking, defining them as any device that delivers nicotine in vapor form.⁴ The Department of Transportation issued a separate rule codifying the e-cigarette ban for enforcement.⁵

Federal Buildings

Executive Order 13058 prohibits smoking tobacco products in all interior space owned, rented, or leased by the executive branch, and extends to outdoor areas near air intake ducts. Agencies may create designated smoking areas only if they are fully enclosed, exhausted directly to the outside, and kept under negative pressure. No employee can be required to enter a designated smoking area during business hours while smoking is ongoing.⁶ The General Services Administration codified this policy at 41 CFR 102-74.315.⁷

Public Housing

Since July 2018, every public housing authority has been required to enforce a smoke-free policy banning lit tobacco products and hookahs in all living units, interior common areas, administrative offices, and outdoor spaces within 25 feet of housing and office buildings.⁸ The 25-foot perimeter includes balconies, porches, and decks. The federal rule does not ban e-cigarettes, though individual housing authorities can include them. If you live in public housing, the smoke-free policy should appear in your lease.

What Counts as Smoking

Traditional cigarettes, cigars, and pipe tobacco are the core targets. What else is covered has expanded considerably.

Electronic Cigarettes and Vaporizers

Twenty states plus the District of Columbia and Puerto Rico include e-cigarettes in their comprehensive smoke-free indoor air laws, so vaping is prohibited wherever smoking is.⁹ In states that haven’t amended their statutes, individual cities and counties often add e-cigarettes through local ordinances. At the federal level, the FDA classifies products containing nicotine from any source, including synthetic nicotine, as tobacco products subject to the minimum purchase age of 21.¹⁰

Cannabis

Over 40 states and territories now restrict marijuana use in at least some of the spaces covered by their smoke-free laws. In states where cannabis is legal, this is where people most often get tripped up. You can lawfully possess and use it, but you usually cannot smoke or vape it anywhere that tobacco is banned.

Heat-Not-Burn and Other Devices

Most state statutes define “smoking” broadly enough to capture any lighted or heated tobacco or plant product. That language reaches heat-not-burn devices, which warm tobacco without combustion, and hookah pipes. Whether a particular new product falls under a given state’s law depends on the exact statutory wording.

Common Exemptions

No state bans smoking absolutely everywhere. Each clean indoor air act carves out certain locations and business types.

Private residences. Your home is generally exempt unless you operate a licensed childcare facility or healthcare-related business there during operating hours. HUD’s public housing rule is the major exception.
Hotel rooms. Many states let hotels designate a percentage of guest rooms as smoking-permitted, provided those rooms are physically separated from smoke-free areas with independent ventilation.
Tobacco shops and cigar bars. Retailers whose primary business is selling tobacco for on-site consumption often qualify. The revenue threshold varies: some states require tobacco sales to account for 80 percent of gross income, others set the bar at 50 percent or lower. These businesses usually must register or certify their exempt status annually.
Private clubs and fraternal organizations. Some states allow smoking in facilities used exclusively by dues-paying members, particularly when the organization has no paid employees on site. These exemptions are narrower than they sound, and many states have eliminated them.

Exemptions are not automatic. Businesses that qualify generally need to file documentation with a state agency or licensing board, and the burden of proving eligibility falls on the owner. Letting an exemption lapse or missing a revenue threshold can trigger enforcement with no grace period.

What Businesses Must Do

Compliance requires more than telling people not to smoke. Most states impose specific obligations that carry penalties if ignored.

Signage. You must post “No Smoking” signs or the international no-smoking symbol at every public entrance and in prominent interior locations. Many states specify minimum lettering dimensions or require the standardized icon. Some states produce official signs and compliance toolkits.

Removing smoking accessories. Ashtrays, lighters provided for customer use, and similar items must be removed from areas where smoking is prohibited. Leaving an ashtray on a table in a smoke-free restaurant is treated by inspectors as evidence of noncompliance.

Duty to intervene. When you or your staff see someone smoking in a restricted area, most states require you to inform the person of the law and ask them to stop. Failing to address a violation you witnessed can make you liable alongside the smoker. You are not expected to physically remove anyone, but you are expected to communicate the rule clearly.

Employee notification. Employers must inform current employees and new applicants about the workplace smoking prohibition. This parallels the federal requirement for public housing authorities to include the policy in tenant leases.

How Violations Are Reported and Penalized

Enforcement is complaint-driven in most states. A customer, employee, or passerby files a complaint with the state health department or a local health board, often through an online portal or hotline. Health inspectors investigate, which can include unannounced visits. They look for active smoking, missing signage, ashtrays in prohibited areas, and evidence that management has or hasn’t addressed violations.

Penalties are almost always civil fines rather than criminal charges. For a first offense, business fines typically range from a few hundred dollars up to roughly $2,500, depending on the state. Repeat violations bring escalating fines and, in some jurisdictions, suspension of operating permits or business licenses. Violation records are generally public and can surface during future inspections or licensing reviews.

Individuals caught smoking in a restricted area can face separate fines, independent of any penalty the business receives. The smoker’s fine is usually smaller, but it exists so business owners aren’t the only ones held accountable.

If You Report a Violation at Work

Federal law protects workers who report smoking violations. Under Section 11(c) of the Occupational Safety and Health Act, your employer cannot fire, demote, transfer, or otherwise retaliate against you for complaining about workplace health and safety conditions, including indoor air quality.¹¹ You can file directly with OSHA and ask that your identity be kept confidential from your employer.¹²

If retaliation occurs, you must file a complaint with the Secretary of Labor within 30 days. OSHA will investigate, and if it finds a violation it can bring an action in federal court seeking reinstatement and back pay.¹¹ The 30-day window is short and inflexible.

How State and Local Rules Interact

Whether a city or county can go further than the state depends on preemption. In states where the law acts as a floor, municipalities can pass stricter rules. A city might ban smoking in public parks, on beaches, or in outdoor dining areas even if the state statute doesn’t address those locations. Local governments in these states often move ahead of state legislatures on e-cigarettes and outdoor smoking.

In states with express preemption, local governments cannot create rules that differ from the statewide standard. The state law is both the minimum and the maximum restriction. That produces uniform rules across the state, which simplifies compliance for multi-city businesses but frustrates local health officials who want stronger protections.

If you run a business in a state without preemption, check both the state statute and any applicable city or county ordinances. The stricter rule controls. Local ordinances frequently extend bans to outdoor patios, sidewalk cafés, and public plazas that state law leaves unregulated. Inspectors are generally unsympathetic to the argument that you only checked the state law.

1
Centers for Disease Control and Prevention. STATE System Smokefree Indoor Air Fact Sheet
2
Centers for Disease Control and Prevention. STATE System Multiunit Housing Fact Sheet
3
Centers for Disease Control and Prevention. STATE System Vehicles Fact Sheet
4
Office of the Law Revision Counsel. 49 USC 41706 – Prohibitions Against Smoking on Passenger Flights
5
U.S. Department of Transportation. Final Rule: Use of Electronic Cigarettes on Aircraft
6
GovInfo. Executive Order 13058 – Protecting Federal Employees and the Public From Exposure to Tobacco Smoke in the Federal Workplace
7
Federal Register. Federal Management Regulation – Real Property Policies Update – Smoking Restrictions
8
eCFR. 24 CFR Part 965 Subpart G – Smoke-Free Public Housing
9
Centers for Disease Control and Prevention. STATE System E-Cigarette Fact Sheet
10
U.S. Food and Drug Administration. Tobacco 21
11
Whistleblowers.gov. Occupational Safety and Health Act (OSH Act), Section 11(c)
12
Occupational Safety and Health Administration. Indoor Air Quality – Frequently Asked Questions