In Kenya article from BBC
The Tobacco Control Act came into effect on Tuesday, making it illegal for smokers to indulge their need for a puff virtually anywhere - including their own homes.
Aside from bars, offices, theatres, streets and places of worship, smoking is also now banned in parks, markets and private cars.
The law sets out hefty penalties for those caught in breach of the rules - prison terms of up to three years and a maximum fine of $46,000 (£23,000).
Several municipalities banned public smoking last year. Smokers in the capital, Nairobi, have had to huddle around designated "smoking zones" around the city.
The new law restricts smoking to sealed and ventilated rooms, so smokers fear even these zones could be threatened.
But smokers are defiant, and many say they will not stop smoking because of the new law.