When cannabis is irradiated, it has been treated with a type of ionising radiation that reduces the presence of bacteria, viruses, and fungi in plant matter.

Because this is an extra measure to sterilise cannabis, irradiated medical cannabis is often preferred by patients suffering with a compromised immune system or a chronic illness. Microbes like bacteria, viruses, and fungi are also expelled when cannabis is heated, for example when being vaped, but irradiation ensures their expulsion. 

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