Although the odds were higher among individuals who started smoking when they were younger than 20, we did not observe an increasing trend in the risk by duration of smoking.
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Unveiling an Association between Waterpipe Smoking and Bladder Cancer Risk: A Multicenter Case-Control Study in Iran.
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The sentences
Most users (75%) reported using non-flavored tobacco and had a borderline significant association with the risk of bladder cancer (OR = 1.62; 95% CI, 0.99–2.65).