An internationally recognizable "no<unk> " sign An internationally recognizable black "authorization to smoke" sign<unk> s, or smoke-free laws, are public policies, including criminal laws and occupational safety and health regulations, that prohibit tobacco<unk>  in certain spaces. The spaces most commonly affected by<unk> s are indoor workplaces and buildings open to the public such as restaurants, bars, office buildings, schools, retail stores, hospitals, libraries, transport facilities, and government buildings, in addition to public transport vehicles such as aircraft, buses, watercraft, and trains. However, laws may also prohibit<unk>  in outdoor areas such as parks, beaches, pedestrian plazas, college and hospital campuses, and within a certain distance from the entrance to a building, and in some cases, private vehicles and multi-unit residences. The most common rationale cited for restrictions on<unk>  is the negative health effects associated with secondhand smoke (SHS), or the inhalation of tobacco smoke by persons who are not<unk> . These include diseases such as heart disease, cancer, and chronic obstructive pulmonary disease. The number of<unk> s around the world increased substantially in the late 20th century and early 21st century due to increased knowledge about these health risks. Many early<unk>  restrictions merely required the designation of non-smoking areas in buildings, but policies of this type became less common following evidence that they did not eliminate the health concerns associated with SHS. Opinions on<unk> s vary. Many individuals and organizations such as the World Health Organization (WHO) support<unk> s on the basis that they improve health outcomes by reducing exposure to SHS and possibly decreasing the number of people who smoke, while others oppose<unk> s and assert that they violate individual and property rights and cause economic hardship, among other issues.
Smoking ban
Smell training
Regulation of electronic cigarettes
Reverse smoking
Meal replacement
Anti-aging supplements
Food fortification
Career counseling