Synthetic cannabinoid products can be toxic. As a result, people who smoke these products may react with rapid heart rates, vomiting, agitation, confusion, and hallucinations. Some need help in emergency medical services or in hospital emergency departments or intensive care units. Concentrates, such as drops, wax and oil, can have much higher amounts of THC (40 to 90%) than other forms of cannabis, which typically have around 20% THC.
Concentrates can cause a faster and more intense effect than other forms of cannabis and may increase health risk. Cannabis added to food and beverages has a delayed and longer-lasting effect than smoked or vaped cannabis.