No there shouldnt be but if there is see your doctore
Answer:
Nicotine causes addiction by triggering the release of dopamine to the brain. Every time someone uses nicotine, dopamine is released. Over time, the brain learns to crave and depend on this dopamine hit and as it builds a tolerance to nicotine through consistent use, it craves more and more.
D maintaining a certain level of immunized individuals in a society to prevent a pathogen from circulating through the population
Is their supposed to be a picture included?
using protection... pulling out...