ira casson. >> dr., who is an expert, but an abrasive person who is contemptuous of the arguments that concussion can cause damage. >> narrator: casson had once joined pellman in attacking omalu's work. now one of casson's first moves: a public denial of omalu's conclusions. >> ira casson leads a team of nfl doctors who did a study of several hundred active players and reported that the concern over head injuries is overblown. >> is there any evidence, as far as you're concerned, that links multiple head injuries among pro football players with depression? >> no. >> dr. ira casson ends up with this very famous exchange that earns him the nickname "dr. no." >> with dementia? >> no. >> with early onset of alzheimer's? >> no. >> and ira casson was asked repeatedly, "is there any link between trauma, head trauma, and the kind of dementia we're seeing in these players?" and he says, "no, no, no, no." >> is there any evidence as of today that links multiple head injuries with any long-term problem like that?

that's heavily addicted to, 300,000 people are treated for smoking relate it illnesses, is step stp casson reports. >> 60 million people smoke and also 20% of the teenagers be between 13 and 15 years old smokes. it is easy and cheap to buy cigarettes in indonesian. for a package like this, you pay less than $2, compared to $nine in syria. these are cigarettes with cloves inside. i'm asking the seller what do you think about cigarettes? >> he says according to him it's not a bad thing to do,ists actually healthy, it has a good taste and that's why it's important to smoke. indonesia, has an international convention that would force countries to put limitation is on smoking but many people start smoking here before the age of 10. it is the powerful lobby of tobacco companies who have managed to counter efforts, gives jobs for around 6 million indonesia nrvetions, and they fear these jobs will be lost and the country will mess out on such, but treating 300,000 is also costing the country dearly. >> tense of thousands ofless has taken to the banded from political office for 15 years but he insi