Topic: Health

New research shows that combining cannabis edibles with alcohol can make driving more impaired than using either substance alone. The study found that standard field sobriety tests often failed to detect impairment caused by cannabis, whether it was consumed by itself or alongside alcohol.

Researchers at Johns Hopkins Medicine conducted a study to investigate how cannabis edibles and alcohol affect driving. They recruited 25 healthy adults between the ages of 21 and 55 who had previously used both substances together within the past year. The participants attended multiple outpatient sessions, where they received either a cannabis brownie containing THC or a placebo brownie, along with an alcoholic beverage or a placebo drink. The researchers found that combining cannabis edibles with alcohol can impair driving more than using either substance alone. They also discovered that standard field sobriety tests often failed to detect impairment caused by cannabis, whether it was consumed by itself or alongside alcohol.

The study's lead author, Austin Zamarripa, Ph.D., said that the findings indicate that co-use of cannabis and alcohol produces significantly greater driving impairment and subjective intoxication than either substance alone. The researchers suggest that the interaction between cannabis edibles and alcohol is not merely additive, but may be synergistic in producing impairment.

The study's results raise questions about current legal standards. According to the researchers, the legal alcohol intoxication threshold used across most of the United States (0.08% breath alcohol level, or BrAC) may not adequately reflect driving impairment when alcohol is combined with cannabis.

Why It Matters

This study matters because it highlights the importance of considering the interaction between cannabis and alcohol when evaluating driving impairment. As cannabis legalization expands in many countries, including India, it's crucial to understand how combining these substances can affect driving abilities.

Key Facts

• The study found that combining cannabis edibles with alcohol can impair driving more than using either substance alone.
• Standard field sobriety tests often failed to detect impairment caused by cannabis, whether it was consumed by itself or alongside alcohol.
• The legal alcohol intoxication threshold used across most of the United States (0.08% breath alcohol level, or BrAC) may not adequately reflect driving impairment when alcohol is combined with cannabis.
• The study involved 25 healthy adults between the ages of 21 and 55 who had previously used both substances together within the past year.
• The participants attended multiple outpatient sessions, where they received either a cannabis brownie containing THC or a placebo brownie, along with an alcoholic beverage or a placebo drink.

Key Terms

THC

Tetrahydrocannabinol, the main psychoactive compound in cannabis

Implications

This study matters because it highlights the importance of considering the interaction between cannabis and alcohol when evaluating driving impairment. As cannabis legalization expands in many countries, including India, it's crucial to understand how combining these substances can affect driving abilities.