Article: “The Economist, Apr 5-11th
Your genes may control how much you smoke—and how likely you are to get lung cancer as a result
…what causes smoking?
That answer lies in part of human chromosome 15, and depends on what is known as allele T of SNP rs1051730. A SNP, or single-nucleotide polymorphism, to give its full name (the short version is pronounced “snip”), is a place where genomes routinely differ from one another by a single genetic letter. In this case, the variation happens inside a gene for one of the receptor molecules that nicotine attaches itself to when it produces its buzz. Based on a study of 13,945 Icelandic smokers, deCODE's researchers showed that having a T in the appropriate part of the gene correlates very strongly indeed with being a heavy smoker. The team estimates that the chance of their being wrong is less than one in a thousand trillion.
The T variant does not, however, increase the likelihood that someone will take up smoking in the first place. That is either a matter of free will or, if it is genetic, is controlled by genes somewhere else.
It all looks neat and simple—and extremely plausible. Genes promote smoking; smoking promotes cancer. However, it might be wrong. For another paper in Nature, and a third in its sister journal Nature Genetics, report similar studies that have drawn rather different conclusions.
..they have concluded that genetic variation there acts directly on a person's susceptibility to lung cancer, rather than acting indirectly by modifying his smoking behaviour.
…that genetic variants in the nicotine-receptor-rich part of chromosome 15 are changing not smokers' behaviour, but their susceptibility to cancer.
What is not in doubt, however, is that there is some sort of a link between genetics and lung cancer.
What is fascinating for me here, is that it starts with the “What causes cancer? … Genes” and ends with the definitive statement that what is NOT in doubt is “some sort of link” between genetics and lung cancer. So, there is doubt about the previous statement, but there is doubt as to the concluding one as well… for there is “some sort of link” is not a very definite or scientific conclusion at all!
It is all very subtle. Intimating that genes are responsible for our behaviour, not us. It falls into the same category as genes being responsible for our diseases, not our behaviour, or our lifestyle.
It is about our inability to understand what we term “evil”. For instance, how come all those pious Jews were gassed in the Holocaust? It cannot have been anything that they did. So there must be a malevolent force out there, that is out to get us. One that we have to wage war against. An us against them.
The basic principle of spiritual manifest as material. The “fight” of spiritual and real. The need for the submission of the spiritual to make the material manifest.
About Science and the Scientific Method (coming next...)