By Kelly Rae Chi

Illicit drug use has reached a near-decade high in the US, so it’s perhaps not surprising that public health officials harbor strong hopes for vaccines to treat various addictions. But whereas some experimental vaccines of this sort have shown promise in animal studies and early clinical trials, it seems that some of these shots against addiction—such as immunizations against nicotine—are better positioned to reach the market than others.

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Image: Michael Velardo, Flickr