What is THC? Complete Guide to Tetrahydrocannabinol

THC — short for tetrahydrocannabinol — is the primary psychoactive compound in cannabis. It's the molecule responsible for the euphoric "high" that recreational users seek and the therapeutic relief that medical patients rely on. Understanding THC is the foundation for making informed cannabis choices.

What is THC?

THC is one of over 100 cannabinoids found in the cannabis plant. It was first isolated in 1964 by Israeli chemist Raphael Mechoulam. When consumed, THC binds to CB1 receptors in the brain and nervous system, producing effects ranging from euphoria and relaxation to altered perception of time and heightened sensory experiences.

THC concentrations vary widely across strains and products. Flower typically ranges from 10–30% THC, while concentrates can exceed 90%. The potency directly affects the intensity and duration of effects.

How THC Works in Your Body

Your body has a built-in endocannabinoid system (ECS) that regulates mood, appetite, pain, and sleep. THC mimics a natural endocannabinoid called anandamide by binding to CB1 receptors, which are concentrated in the brain.

• Onset: Inhaled THC takes effect in 1–5 minutes; edibles take 30–90 minutes.
• Peak: Inhaled peaks at 15–30 minutes; edibles peak at 1–3 hours.
• Duration: Inhaled effects last 1–3 hours; edibles can last 4–8 hours.
• Metabolism: THC is processed by the liver, where it converts to 11-hydroxy-THC (more potent) in edible form.

Types of THC

Not all THC is the same. Here are the most common forms you'll encounter:

• Delta-9 THC: The classic, most abundant form. This is what people typically mean by "THC."
• THCA: The raw, non-psychoactive precursor found in fresh cannabis. It converts to delta-9 when heated (decarboxylation).
• Delta-8 THC: A milder variant that occurs in trace amounts naturally. Produces a less intense high.
• THCV: A less common variant that may suppress appetite and provide a shorter, energetic buzz.

THC Dosing Guide

Finding the right dose depends on your tolerance, body weight, and consumption method. Here's a general framework:

• Microdose (1–2.5 mg): Subtle mood lift, minimal impairment. Great for first-timers.
• Low dose (2.5–5 mg): Mild euphoria, light relaxation. Good for beginners.
• Moderate dose (5–15 mg): Noticeable high, stronger euphoria. For occasional users.
• High dose (15–30 mg): Strong effects, significant impairment. Experienced users only.
• Very high (30+ mg): Intense effects, risk of anxiety or discomfort. Not recommended for most.