Hi, sorry to take so long getting back to you! I was out of town without computer access most of this week. Anyway, as to your question, 1,000,000,000 (or 109) ng = 1 g, or, 1 ng = 10�? g. So, 8.4 mg would be
8.4 mg X 1 g X 1,000,000,000 ng = 8,400,000 ng
1 1000 mg 1 g
Thus, a cigarette contains a very large amount of nicotine. A single cigarette contains about one gram of dry tobacco. The nicotine scale for the food samples would probably be better if they were in ng of nicotine per gram of dry food substance in order to make a better comparison. So what is needed is the percent water in these foods. According to http://www.h2ouniversity.org/html/3-5_facts_life.html, tomatoes are about 90% water and potatoes are 80% water.
Since one gram of a "wet" tomato is 90 percent water and 10% other substances, the amount of nicotine in a dried tomato is as follows:
7.3 ng X 1 g (wet) = 73 ng / g (dry)
1 g (wet) 0.10 g (dry)
This compares to 8,400,000 ng / g in dry cigarette tobacco. For potatoes, the amount of nicotine is similarly calculated to be 15 ng / 0.20 g (dry) = 75 ng / g (dry).
Steve
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