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.
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.