Driving Under the Influence of Marijuana

A call to wisdom, responsibility, and love for neighbor.

Colossians 4:5 “Walk in wisdom toward them that are without…”

As more states legalize recreational marijuana, it becomes easier to downplay what hasn’t changed: driving while impaired still kills. Marijuana can slow reaction time, distort judgment, and reduce attention — and those risks multiply behind the wheel.

Wisdom isn’t just what we know — it’s what we choose when other people’s lives are at stake.

1. Understanding the Effects of Marijuana

Marijuana affects people differently based on strain, potency, method of use, how often someone consumes, body chemistry, and whether other medications or mental health concerns are involved.

Common short-term effects

  • Dry mouth
  • Dry eyes
  • Headache
  • Dizziness
  • Drowsiness
  • Increased appetite
  • Distraction
  • Increased heart rate

Potential long-term concerns (especially with heavy use)

  • Altered brain development in adolescents and young adults
  • Insomnia (often reported among daily users)
  • Weakened immune response and increased respiratory complications
  • Increased blood pressure and higher long-term cardiovascular risk

There is also marijuana use disorder, where a person struggles to stop even when the consequences begin harming relationships, work, school, or emotional health.

2. Why Strain and Strength Matter

Today’s cannabis market varies widely in potency and effect. Even experienced users can be surprised by a new product, a higher dose, or an unexpected reaction.

  • Sativa: Often described as energizing; frequently higher THC
  • Indica: Often associated with relaxation and drowsiness
  • Hybrid: A blend; effects vary significantly by product

3. Why Driving High Is Always Illegal

Even where marijuana is legal to purchase or use, driving under the influence is not. Every state prohibits operating a motor vehicle while impaired by marijuana.

There is no “safe” amount before driving. If it can impair you, it can endanger others.

4. The Problem With Measuring Impairment

With marijuana, impairment is harder to measure than alcohol. THC potency varies, methods differ (smoking vs edibles), and THC can remain detectable after the subjective “high” fades.

Blood tests may confirm THC is present, but they don’t always prove real-time impairment at the moment someone was driving.

5. Field Sobriety Tests and New Technology

Field sobriety tests aren’t perfect, but they can provide insight — especially when combined with other evidence.

  • One-Leg Stand (balance and coordination)
  • Walk-and-Turn (attention + coordination)
  • Modified Romberg (time perception + physical control)
  • Horizontal Gaze Nystagmus (more helpful with alcohol; limited value for marijuana alone)

6. Driving High vs. Driving Drunk

Both are dangerous. Alcohol often increases risk-taking and overconfidence. Marijuana more commonly increases drowsiness, distraction, slower reactions, and altered perception. In many cases, people combine substances — which can multiply risk.

1 Peter 5:8 “Be sober, be vigilant…”

7. FAQs

How long should I wait to drive after using marijuana?

There is no single national standard. Effects depend on the product, dose, method, and the individual. If you feel any impairment — slow thinking, delayed reaction, drowsiness, fogginess — do not drive. When in doubt, wait longer and choose a ride.

Can you drive safely while high?

No. Even if someone feels fine, marijuana can impair reaction time, attention, judgment, and coordination — especially in unexpected situations on the road.

How is marijuana intoxication determined?

Law enforcement may use observations, field sobriety tests, and blood or breath testing where applicable. Testing can confirm THC presence, but it does not always perfectly measure real-time impairment.

Is it worse to drive high or drive drunk?

Both are unlawful and dangerous. Either one can ruin lives in seconds. Don’t do either.

A Final Word: Love Protects

If you choose to consume marijuana — medically or recreationally — make a plan that protects people. Arrange a ride. Stay put. Call someone. Choose wisdom.

Philippians 2:4 “Let each of you look not only to his own interests, but also to the interests of others.”
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