> This study does not show that cocaine has a negligible effect. It shows that cocaine has a less than poverty effect for children that make it to term. Big, big difference.

You're right, I overstated my claim. The effect is negligible with respect to the effects of poverty.

> Cocaine causes increased rates of premature birth

The studies you've linked do not support your statement. The studies say that cocaine use is associated with, not that cocaine is the cause.

re: [1] I never disputed that PT infants have developmental problems.

re: [2] "Studies revealed that in most domains, the neurobiological effects of PCE play a subtle role, with effects no greater than other known teratogens or environmental factors. Associations between PCE and negative developmental outcomes were typically attenuated when models included conditions that commonly co-occur with PCE (eg. tobacco or alcohol exposure, malnutrition, poor quality of care)." and "Preconception and prenatal cocaine use is commonly associated with poor pregnancy outcomes with psychosocial, behavioral, and risk factors, such as poverty, poor nutrition, stress, depression, physical abuse, lake[sic] of social support, and sexually transmitted infection. Illicit drug use during pregnancy is a major risk factor for maternal morbidity and neonatal complications."

re: [3] "Cocaine use during pregnancy was associated with significantly higher odds of preterm birth"

re: [4] "Prenatal cocaine exposure is significantly associated with preterm birth, low birthweight, and small for gestational age infants."