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.
There are more naturally produced brands of tobacco but even the most natural tobaccos still have carbon monoxide, arsenic, etc a lot of harmful stuff that’s inhaled when smoked. Other additives are usually placed in to keep the cigarette lit, you’ll find the natural tobaccos keep going out if you don’t smoke it consecutively to keep the ember lit
One of the factors is that tobacco had a tendency to absorb a natural low level radioactive isotope of naturally occurring plutonium from the soil as it grows. Smoking can put that isotope inside you over a long period of time which can compound the effect of it’s radioactivity to a level that can cellular mutation which can lead to cancer.
This is what was explained to me by an instructor I had some years back and I may be remembering parts wrong but I think I got the gist right.
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