is using tobacco only occasionally dangerous Occasional & Social Smoking Tobacco smoking - Wikipedia
Description
Although carbon monoxide itself is not classified as a carcinogen, it plays a role in reducing overall health and compromising immune responses, which can indirectly promote cancer progression
& Boles, S
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In short order I was promoted to a pack-a-day habit that alternated between Camel Lights, Marlboro Reds, and Dunhills

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So, then, Doyle was Holmes and Holmes was Doyle
