Some items list caffeine contents, such as soda cans. It can usually be found near the UPC code. Coca-Cola, for example, has 33 mg of caffeine per 12 fluid ounces, if I recall correctly.
Nicotine you're shit out of luck. But as I recall, 0.5-1.0 mg/kg is the LD50 for an adult human, which is somewhere in the 30-60 mg range.
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[51 Minstrel] Beethovens Gesamtkunstwerk <Fires of Heaven>
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