Licensed US cannabis shops sell four main product groups: flower, concentrates, edibles, and topicals. The two compounds that matter most are THC, which causes the high, and CBD, which does not. First-time users get the best result from a low THC dose and a wait of two hours before taking more.
Cannabis First-Time Effects Timeline
What Is in Cannabis
Cannabis plants contain more than 100 cannabinoids. THC (delta-9 tetrahydrocannabinol) binds to CB1 receptors in the brain and changes mood, perception, and reaction time. CBD (cannabidiol) does not produce a high. Terpenes are the aromatic oils that give each plant its smell: myrcene, limonene, pinene, and others.
Products carry lab labels with THC and CBD percentages. Flower sold in the 1990s averaged under 4% THC. Flower today tests at 15% to 30%. Concentrates test at 60% to 90%.
Indica, Sativa, and Hybrid
Shops label flower as indica, sativa, or hybrid. Research has not found a chemical split between the types. The difference users report comes from THC level, terpene mix, and dose. Read the lab label first. A name is marketing.
Ways to Consume
- Flower: ground bud smoked in a pipe or joint, or heated in a dry herb vaporizer at 350 F to 430 F.
- Vape cartridge: oil heated by a battery. High THC. Fast onset.
- Edible: gummies, chocolate, drinks. THC passes through the liver and becomes 11-hydroxy-THC, a stronger compound.
- Tincture: oil or alcohol drops held under the tongue.
- Topical: lotion or balm. No high in most cases.
Onset Time and Duration
- Inhalation: effects in 1 to 10 minutes. Peak at 30 minutes. Duration 2 to 4 hours.
- Edible: effects in 30 minutes to 2 hours. Peak at 2 to 4 hours. Duration 4 to 8 hours.
This gap causes most bad first experiences. A user eats half a gummy, feels nothing at 45 minutes, eats the other half, and both doses hit at once.
Dosing for a First Session
- Start at 2.5 mg THC or less for an edible. Many states cap a single serving at 10 mg and a package at 100 mg.
- For inhalation, take one puff of low THC flower and wait 15 minutes.
- Set a limit before you start and write it down.
- Do not mix with alcohol. Both depress the central nervous system.
Buying at a Dispensary
Adult-use states require a government ID showing age 21 or older. Medical patients in some states qualify at 18 with a state card. Purchase limits apply per transaction. Washington, for example, allows 1 ounce of flower, 16 ounces of solid edible, and 7 grams of concentrate. Budtenders can explain lab results and serving size.
Side Effects and Risks
Short-term effects include dry mouth, red eyes, fast heart rate, anxiety, and memory trouble. High doses can cause nausea, paranoia, and a sense of losing control. Symptoms pass in a few hours. Food, water, and a calm room help.
Call 911 for chest pain, trouble breathing, or a seizure. CDC data shows about 3 in 10 people who use cannabis develop cannabis use disorder at some point.
Do not drive after use. Cannabis impairs judgment, motor coordination, and reaction time. Keep products in child-resistant packaging and away from children and pets. Edibles look like candy. Call Poison Control at 1-800-222-1222 if a child eats a product.
Storage
Keep flower in a sealed glass jar away from light and heat. THC converts to CBN over time. Label each container with the THC content and the date. The FDA has not approved cannabis for any medical use. Approved cannabinoid drugs are limited to purified CBD for specific seizures and synthetic THC products.