article_snippet.sent: Because the herbs and chemicals in Spice vary, it is impossible for users to know what users are smoking - and in what concentrations .
article_snippet.sent: Because the herbs and chemicals in synthetic marijuana vary, it is impossible for users to know what users are smoking.
article_snippet.sent: users also cannot tell what concentrations users are taking - which can lead to fatal overdoses.
article_snippet.sent: Unlike pot, Spice can cause a huge range of symptoms, many of which can be severe.
article_snippet.sent: Because the herbs and chemicals in Spice vary, it is impossible for users to know what users are smoking and in what concentrations - which can potentially lead to fatal overdoses.
article_snippet.sent: Doctors were unable to detect spice in California teenager Connor Eckhardt's system - there is no way to trace its everchanging components.
highlights_snippet.sent: Because chemicals in Spice vary, users do not know what users're smoking .