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^ Source it. AFAIK cannabis contains no significant traces of any radionuclides, at least no more than any other ordinary plant or organism on this planet.
Tobacco is a special case though because it is grown in soil fertilized with calcium phosphate derived from apatite mineral containing radium, lead 210 and polonium 210. These radionuclides become stuck in the tobacco trichomes and concentrated on the leaf.
Two different ballgames.
Tobacco suffers from two different sources of pollution, which causes it to become more cancerous than it would naturally be: Fertilizers and topical pesticides. Both of which are never properly flushed out of or off of the plant. Not to mention the added common variable of the soil having been fertilized and having pesticides flushed through it for countless generations of crops, adding more to the overall toxicity of the matter.
However, radioactive particulates are a product of actually burning the plants. There is really no way to avoid them entirely, unless you eat the plant. As for which smoke would contain more? I am not sure. As far as which plant is overall more toxic, commercial tobacco versus Cannabis which has been responsibly grown, no brainer.