Cigarette Smoking and leukemia

Yes, Cigarette smoking is associated with Leukemia.  The following is an abstract from a paper from 1993.

Cigarette smoking may be a risk factor for leukemia. No detailed biological mechanism has been proposed, but a causal link is made plausible by evidence of systemic effects of cigarette smoke and the presence in cigarette smoke of chemicals that have been associated with leukemia risk.

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CONCLUSIONS: Cigarette smoking is associated with increased risk for leukemia and may lead to leukemias of specific morphologic and chromosomal types. The association varies with age.

Read the whole Abstract here:  http://www.ncbi.nlm.nih.gov/pubmed/8246285