Biological approach to smoking

1. ____ et al studied over 1000 MZ and DZ twins aged 8-16. (4)
4. They found a significant _______ influence in the use of tobacco and other drugs. (7)
5. _______ found that when smokers were shown cigarette packets experienced strong activation in specific areas of the brain. (7)
6. Increasing evidence suggests that the brain's ______ system may also play an important role in addiction (6)
7. Addicts don't have enough ________, therefore they take substances to enhance this. (8)

2. A problem with using twin studies is that ___________ rates are never 100%, showing that addiction is not completely biological. (11)
3. In this part of the brain the _________________ are activated during states of pleasure. (17)
8. _______ looked at 42 MZ twins who had been reared apart at birth. (7)
9. You may be ___________ to an addiction if somebody in your family has an addiction. (11)
10. The person therefore _______ the substance again and again because they want to feel this pleasure. (7)

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