This was discussed a lot in the cannabis community a few years ago though the topic seems to have died down. The consensus among people heavily involved in cann

This was discussed a lot in the cannabis community a few years ago though the topic seems to have died down. The consensus among people heavily involved in cannabis is that it is related to overuse of neem oil, an organic pesticide. Some growers had been using neem very liberally without keeping in mind that the active ingredients are toxic to humans. The toxicity of neem seems to be in line with the effects of cyclical vomiting/hypermesis. So, it has been a thing to shun and shame people using that pesticide for a few years.