It would be if marijuana were grown in open fields and fertized by crop dusters. As of right now most weed is fertilized by hand so the fertilizer doesn't get on the flowers.
The next link is the first source for the Wikipedia paragraph I originally quoted. They say that somebody found about half of the polonium contained in tobacco to be inside of the leaves.
https://www.ncbi.nlm.nih.gov/pubmed/25254600
The next link is the first source for the Wikipedia paragraph I originally quoted. They say that somebody found about half of the polonium contained in tobacco to be inside of the leaves.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2509609/
But then, it doesn't say much about marijuana buds because accumulation varies between plant species and parts of the same plant.