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Some studies suggest that cocaine-exposed babies are at increased risk of birth defects, including urinary tract defects and, possibly, heart defects

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'Why smoking impairs the ability to learn about safety is not clear, but one possibility is that smoking changes neurotransmitter balances in the brain, which are necessary for successful safety learning.' Dr Haaker and his colleagues now hope to unravel the mechanism underlying this effect with the hope of developing new treatments and perhaps even new drugs

After a year, he ended up dropping out, coming home, and from that point on he kind of bounced between working and selling cocaine