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The South Dakota Medicine journal writes of twin and family studies that have shown that there are several genes that cause an individual to become more susceptible to being addicted to nicotine. The genes in question determine how many receptors the brain produces to metabolize the nicotine in an inhalation

They are also being found by Trading Standard teams fitted to otherwise compliant items being imported

But don't worry

Pharmacol Rev 34: 189222

Openly accessible at /journal/HEALTH/ 1432 Figure 1

When smoking cigarettes, your body actually only absorbs around 1-2mg, so when smoking 20 cigarettes a day, you could be inhaling 20-40mg of nicotine