Medical cannabis highs are psychoactive effects caused by tetrahydrocannabinol (THC). THC binds to CB1 receptors in the brain. CBD does not cause a high. CBD can reduce some THC effects.
What Causes the High
THC is the main psychoactive compound in cannabis. The liver converts inhaled or oral THC into 11-hydroxy-THC. This metabolite is more potent. It crosses the blood-brain barrier.
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CBD is not psychoactive. It can block or change THC effects at some receptors. Products with equal THC and CBD produce a weaker high than THC-only products.
How Route Changes the High
Inhaled THC enters the blood through the lungs. Effects start in 1 to 10 minutes. Peak effects occur at 15 to 30 minutes. Effects last 1 to 3 hours.
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Oral THC goes through the liver first. Effects start in 30 to 90 minutes. Peak effects occur at 2 to 4 hours. Effects last 4 to 8 hours. Oral doses produce stronger 11-hydroxy-THC levels.
Dose and Product Ratio
Dose controls the high. A 2.5 mg THC dose can relieve pain without a high in some patients. A 10 mg THC dose can cause a strong high in a new user. A 10 mg dose can be mild in a daily user.
Product labels list THC and CBD percentages. A product with 20% THC and 0.1% CBD gives a strong high. A product with 5% THC and 10% CBD gives a weak high.
Medical Use and the High
Some patients want a high. Others do not. Medical cannabis treats pain, nausea, and spasticity. The high can be a side effect. The high can also be part of the therapy for some conditions.
Doctors do not prescribe a specific high. They adjust dose and product. Start low. Go slow. This reduces side effects like anxiety and dizziness.
State Rules and Labels
State medical cannabis programs require lab testing. Tests show THC and CBD content. Some states cap THC in medical products. Few states cap THC for all patients. Check your state rules.