Can I take legal action about a neighbor's cigarette smoke in Japan?

What the Law Says

Japanese law does not ban smoking indoors outright, but recognizes secondhand smoke as a potential 'nuisance' under civil and local regulatory frameworks. Courts assess whether smoke intrusion exceeds socially acceptable limits based on frequency, intensity, and impact on daily life.

Article 709 of the Civil Code establishes liability for unlawful acts causing damage, including persistent environmental harm like intrusive smoke. Courts have held that chronic exposure to tobacco smoke in shared housing can constitute an 'unlawful interference with the use and enjoyment of property.'

The Health Promotion Act (Act No. 101 of 2002) mandates 'efforts to prevent passive smoking' (Article 25), and local governments may enact stricter rules under the Local Autonomy Act (Act No. 67 of 1947). Over 1,700 municipalities—including Tokyo, Osaka, and Sapporo—have adopted ordinances requiring landlords and tenants to take reasonable measures against smoke drift.

In the 2018 Osaka District Court case (Heisei 30 (Wa) No. 1247), the court ordered a tenant to cease smoking near shared ventilation shafts after finding repeated smoke infiltration into a neighboring apartment violated Article 237 of the Civil Code (neighbourhood relations) and caused measurable health impairment.

Statutory Text

A landowner must not use their land in a manner that unreasonably interferes with the use and enjoyment of adjacent land.

— Civil Code, Article 237

Statutory Text

Municipalities may enact ordinances concerning public health and welfare within their jurisdiction.

— Local Autonomy Act, Article 14

What to Do

Sources

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