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Driving Under the Influence of Cannabis: Laws and Risks ​

How Cannabis Affects Driving ​

THC impacts reaction time, coordination, and depth perception. While regular users may feel less impaired, studies show that even small amounts of THC can affect driving ability.

Cannabis DUI laws vary by state:

  • Zero Tolerance States – Any detectable THC in a driver's system can lead to a DUI.
  • Per Se Laws – Some states set a specific THC blood limit (e.g., 5 nanograms per milliliter).
  • Impairment-Based Laws – Officers assess impairment based on field sobriety tests and behavioral signs.

Consequences of a Cannabis DUI ​

  • Fines and License Suspension – A first offense often leads to fines and a temporary loss of driving privileges.
  • Criminal Record – Some states classify cannabis DUIs as misdemeanors or felonies.
  • Increased Insurance Costs – A DUI can result in higher premiums.

How Long Should You Wait Before Driving? ​

  • Smoking or vaping – Wait at least 4 to 6 hours.
  • Edibles – Effects can last 6 to 12 hours or longer.
  • Frequent users – THC can linger in the system, making exact timing difficult to determine.

Key Takeaways ​

  • THC impairs driving ability, even for experienced users.
  • DUI laws vary by state, with penalties ranging from fines to jail time.
  • If consuming cannabis, arrange alternative transportation rather than risk impaired driving.

Being responsible with cannabis use includes knowing when it is safe to drive.