In my Biology class (Higher Level Freshmen Course) we learned about people being able to read genetic code. When someone turns 10 years old we can read there genetics and see what diseases they are going to get no matter what and what diseases they're for sure going to get. We learned about people who lived a very healthy life style and got cancer. I know of a 70 year old family friend who never eats anything bad and works out and he got cancer and survived. It costs about $350,000 so it is not common knowledge but if you were the son of someone like Bill Gates would you want to know this information? This is also a way how people will find cures for diseases. They can pretest it and then do a transplant. I am going to donate my organs when I'm dead you should too. If you do drugs or drink you are not guaranteed to get a disease but it raises your chances. I suggest sticking to Marijuana only and drinking occasionally.