Cigarette companies begin arguments today in a West Virginia lawsuit that accuses them of ignoring the health of smokers. The companies are hoping to cast doubt on a class-action claim that healthy smokers need free diagnostic tests to protect them from disease. It's the first medical monitoring case against major tobacco companies to be tried in the United States. The suit seeks free medical tests for 250-thousand smokers in West Virginia. The participants are people who have smoked a pack a day for at least five years, but, who aren't sick. The companies say a medical screening program could harm patients with invasive and unnecessary follow-up tests.