By Kashmira Gander

As states legalize cannabis, the day-to-day challenges presented by lifting such bans need ironing out. One such problem is how long to wait before driving after lighting up. 

It’s a question that researchers at the University of California San Diego (UCSD) aim to answer with a new study. And they’re inviting members of the public to help them find out.

Dr. Tom Marcotte, professor of psychiatry and co-director of the CMCR, told ABC15: "If you smoked this morning, are you impaired throughout the day? Are you impaired for a couple of hours? Or are you not impaired? We're trying to answer that.”

Compared with drink-driving, it is harder to pinpoint whether THC (the psychoactive ingredient in cannabis) can impact a person’s ability to drive as levels of the cannabinoid can be present in a user’s system but have no effect, said Marcotte.

The team are looking for healthy adults who have smoked cannabis in the past. Chosen participants will be asked to smoke cannabis, and then complete driving simulations, according to a statement released by the Center for Medical Cannabis Research at UCSD.

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