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Long-term use of nicotine vs placebo gum.
Hughes JR, Gust SW, Keenan R, Fenwick JW, Skoog K, Higgins ST. Hughes JR, et al. Arch Intern Med. 1991 Oct;151(10):1993-8. Arch Intern Med. 1991. PMID: 1929687 Clinical Trial.
Symptoms of tobacco withdrawal. A replication and extension.
Hughes JR, Gust SW, Skoog K, Keenan RM, Fenwick JW. Hughes JR, et al. Arch Gen Psychiatry. 1991 Jan;48(1):52-9. doi: 10.1001/archpsyc.1991.01810250054007. Arch Gen Psychiatry. 1991. PMID: 1984762 Clinical Trial.