CVS (CVS) stopped selling cigarettes nearly a month earlier than expected, since the chain had previously announced the ban would go into effect by Oct. 1.
CVS, which has about 7,700 retail pharmacies, announced earlier this year that it would be the first major pharmacy chain to stop selling cigarettes at all its stores.
Prior to the companywide ban, the chain sold cigarettes at all but two stores in San Francisco and dozens of stores in Massachusetts, in compliance with local anti-tobacco ordinances.
The company has estimated that it could lose about $2 billion in annual sales. But that's a fraction of its revenue, which totaled $126 billion in 2013.
Much of the revenue comes from healthcare services such as walk-in clinics and prescription drug coverage.
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