Chinese tombs yield earliest evidence of cannabis use
Researchers have uncovered the earliest known evidence of cannabis use, from tombs in western China.
The study suggests cannabis was being smoked at least 2,500 years ago, and that it may have been associated with ritual or religious activities.
Traces of the drug were identified in wooden burners from the burials.
The cannabis had high levels of the psychoactive compound THC, suggesting people at the time were well aware of its effects.
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