Some of the carcinogens may come from radioactive isotopes of phosphorus used to fertilize the plants as they grow. Sorting **atoms** by mass can be done, but is ridiculously expensive and really only done to enrich uranium in very small amounts relative to the amount of fertilizer used.
Some of the carcinogens may be byproducts of the preservation process of smoking the tobacco. Removing this step would reduce the flavor, and allow the tobacco to spoil after production.
Some of the carcinogens may be byproducts of burning the cigarette to smoke it. You can’t get rid of these without getting rid of the cigarette.
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