Yes, there have been reports of fatalities caused by synthetic marijuana use.

https://recoverypartnernetwork.com/drug/illicit/synthetic-marijuana-addiction

There is no safe dose for synthetic marijuana.

https://recoverypartnernetwork.com/drug/illicit/synthetic-marijuana-addiction

Secondhand marijuana smoke can induce a high if someone is in an enclosed space. It can also affect heart and blood vessels, similar to secondhand tobacco smoke.

https://recoverypartnernetwork.com/drug/illicit/smoking-marijuana

Vaping marijuana is considered unsafe in comparison to smoking marijuana as the chemicals and toxic metal particles found in vaporizers are harmful on their own.

https://recoverypartnernetwork.com/drug/illicit/smoking-marijuana

Individuals who smoke marijuana with high THC levels may experience brief psychosis.

https://recoverypartnernetwork.com/drug/illicit/smoking-marijuana

Marijuana smoke contains a toxic mix of gases and tiny particles that can harm the lungs. Smoking marijuana may result in the same health complications as smoking tobacco.

https://recoverypartnernetwork.com/drug/illicit/smoking-marijuana

Marijuana use during pregnancy can harm the fetus and cause children to be born with decreased cognitive skills. As THC can be excreted into breast milk, breastfeeding mothers are highly advised to refrain from smoking marijuana during that period.

https://recoverypartnernetwork.com/drug/illicit/smoking-marijuana

The half-life of codeine is relatively short, but its metabolites do tend to stay in your system for much longer. Codeine is detectable through a urine test for up to 2 to 3 days, a blood test for up to 24 hours, and a saliva test for up to 1 to 4 days.

https://recoverypartnernetwork.com/drug/opioid/how-long-do-opioids-stay-in-your-system

Fentanyl is a highly potent prescription opioid that is detectable in a urine test between 24 to 72 hours, hair test for up to 3 months, and blood test between 5 to 48 hours, depending on the dose used.

https://recoverypartnernetwork.com/drug/opioid/how-long-do-opioids-stay-in-your-system

Oxycodone generally clears the blood within 24 hours but can be detectable through a urine test for up to 3 to 4 days and a saliva test for up to 4 days.

https://recoverypartnernetwork.com/drug/opioid/how-long-do-opioids-stay-in-your-system