1 December 2020

Cannabis types have different effects on driving

Cannabis users should not drive for at least four hours after inhaling the drug. Research at Maastricht University shows that within this time frame the driver is very likely to drift from side to side on the road. After four hours, cannabis products have little or no observable effect on driving, whether they contain Δ9-tetrahydrocannabinol (THC), or combinations of THC and cannabidiol (CBD), the two main active substances. However, cannabis that only contains CBD has little or no noticeable effect on driving behaviour even in the hours immediately after use. The results of the study were published today in the scientific journal JAMA.