Growing marijuana indoors may not be the most efficient way to take the high, according to research published in the Journal of Clinical Pharmacology.
Researchers from the University of Illinois found that indoor cannabis use increased the risk of psychosis, the condition that causes people to lose their sense of self.
The study looked at more than 2,500 people with schizophrenia and a variety of other psychiatric disorders and found that cannabis users were four times more likely than non-users to experience psychotic episodes in the previous year.
Psychosis is characterized by hallucinations, delusions and delusions of grandeur.
It’s estimated that one in three people will experience at least one psychotic episode in their lifetime, according the National Institute on Drug Abuse.
People who use cannabis in the home are twice as likely to experience a psychotic episode as people who do not, the researchers said.
Cannabis is legal in the United States, but it remains illegal in many European countries.
Ireland is among a few countries in Europe that allows the use of cannabis for medical purposes.
But the country has strict laws on who can buy it and who can sell it, making it harder for people to get access.
The Irish government has said that its laws on cannabis are “well-grounded” and that there is no evidence to suggest it is linked to increased risk of psychotic illness.
However, the government has also warned that there has been a surge in the use and abuse of cannabis, and that it will “take the necessary measures” to protect people’s health.