20. Will coffee make you sick ? Consumer genetics will tell you if you are likely to brake down coffein slowly or rapidly (SNP CYP1A2*1F in the CYP1A2 gene). The health implications are clearly overrated, but perhaps you would still find it interesting to know just how much coffee you have to drink in order to read DNA blogs all night.
21. Quit smoking. Nicotest analyzes two genes Cyp2A6 og DRD2. The testresult will tell the company which of its quit smoking products to sell you. However, if you look really hard you will find (faq, How does it work, section 4 second line and down), that the actual link to genetics is quite weak.