Of course, the ones that have nicotine have a tobacco derived substance, so you could probably do some fancy math and figure out a tobacco weight equivalent.

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The substance, which is derived from graphite, is stronger than diamond, more conductive than copper and more flexible than rubber.

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Carraguard is the proprietary name of a substance made from carrageenan, a carbohydrate gel derived from seaweeds that is widely used as a stabiliser in the food industry.

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The FBI said the substance tested positive for ricin, a toxin derived from castor beans that has no known antidote.

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