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​fred smokes about half a pack of cigarettes a day. although he takes vitamin b supplements, during the day, he is tired, irritable, and has trouble concentrating. what might be the culprit?

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Fred smokes about half a pack of cigarettes a day. although he takes vitamin b supplements, during the day, he is tired, irritable, and has trouble concentrating. what might be the culprit?
too much smoking
Fred is smoking to much
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