structural:expansion, stylistic:tone
Biology

Some medical authors suggest that the biomedical model of problem gambling may be unhelpful because it focuses only on individuals. These authors point out that social factors may be a far more important determinant of gambling behavior than brain chemicals, and they suggest that a social model may be more useful in understanding the issue. For example, an apparent increase in problem gambling in the UK may be better understood as a consequence of changes in legislation which came into force in 2007 and enabled casinos, bookmakers, and online betting sites to advertise on TV and radio for the first time and which eased restrictions on the opening of betting shops and online gambling sites.