By Saabira Chaudhuri

LONDON--British American Tobacco PLC (BATS.LN) reported a rise in first-half profit as the cigarette-maker was helped by investments, even as revenue slid.

The maker of Dunhill and Lucky Strike posted a net profit of 2.65 billion pounds ($4.13 billion) in the six months to June 30, compared with GBP1.75 billion a year earlier, helped by higher finance income and profits from associates and joint ventures.

Revenue fell 5.9% to GBP6.4 billion, but was 2.4% higher at constant exchange rates.

BAT said its results were impacted by volatile currency and strong volume a year earlier, but its chairman, Richard Burrows, said the company "is on course to deliver an improved second half."

BAT's cigarette volume fell 2.9% to 322 billion sticks, a deterioration from the 0.4% decline last year. The tobacco industry has faced a decades-long decline in volume.

Write to Saabira Chaudhuri at saabira.chaudhuri@wsj.com

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