Noticed your eyes looking bloodshot after using cannabis? You're not alone—and there's good news. Red eyes from weed are completely normal and fixable, and you have several safe options to clear them up fast.
Why does this happen? THC (the active compound in cannabis) lowers your blood pressure, which causes tiny blood vessels in your eyes to expand. According to recent research, this dilation increases blood flow and creates that telltale redness—whether you smoke, vape, or eat edibles.
Here's what actually works:
1. Use lubricating eye drops
Over-the-counter drops like Visine or Rohto constrict blood vessels and reduce redness within minutes. Choose preservative-free options if you wear contacts. Apply 1-2 drops per eye and blink gently.
2. Try a cold compress
Soak a clean cloth in cold water, wring it out, and place it over closed eyes for 5-10 minutes. The cold naturally shrinks blood vessels and soothes irritation—no chemicals needed.
3. Stay hydrated
Drink plenty of water before and after cannabis use. Dehydration makes redness worse and can cause dry, uncomfortable eyes. Keep a water bottle handy.
4. Give it time
Redness typically peaks 30 minutes after use and fades within 3-4 hours on its own. If you can wait it out in a comfortable space, your eyes will return to normal naturally.
5. Choose lower-THC strains
If red eyes bother you regularly, consider cannabis products with less THC or more CBD. Studies show that lower THC content causes less blood vessel dilation.
When to talk to your doctor: If redness lasts beyond 8 hours, comes with pain, or affects your vision, schedule an eye exam. While cannabis-related redness is harmless, persistent symptoms could indicate an unrelated issue like infection or dry eye syndrome.
You're already ahead by learning this. Try one simple remedy this week—many people notice clearer, more comfortable eyes within minutes. You've got this.