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Figure 1. Chemical behind Happiness – Dopamine. Retrieved March 29, 2017, from http://www.be-happy.club/chemical-behind-happiness-dopamine/

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Figure 2. Retrieved March 29, 2017, from https://en.wikipedia.org/wiki/File:Development_of_a_rational_scale_to_assess_the_harm_of_drugs_of_potential_misuse_(physical_harm_and_dependence,_NA_free_means).svg

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