A simple guide to pot, THC and how much is too much

THC content varies widely among marijuana strains and among products made from cannabis. Even with edibles, customers may not understand just how much THC they will ingest.

The way it’s consumed, the type of product and individual tolerance all play a part.

Surprisingly, raw cannabis contains very little of the components that “get people high.” It’s the addition of heat from burning, vaping or cooking raw cannabis that activates the compounds.

Heating triggers a chemical process known as decarboxylation, which converts a chemical compound into THC. More than half of the THC can be lost during in the process.

Here is a guide to better understand the THC content of your cannabis.

Smoke calculator

Smoking, whether using a joint, bong or a bowl, results in more THC loss when inhaled — typically between 60 to 63 percent. A vaporizer loses about 46 percent.

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    How much weed will you use?

    The average American joint contains 0.3 grams.

    g
    How smoking methods compare
    ESTIMATED THC INHALED
    THC LOSS DUE TO HEATING
    Joint
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    Vaporizer
    mg
    Accounts for a variety of factors. Does not include THC that is exhaled as the time held in lungs can influence consumption.
    How tolerance may influence effects

    Frequent cannabis use can result in a tolerance to THC. Beginners may want to start with lower potency products or smoke less.

    Weak
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    Too strong
    BeginnerVery low tolerance
    Some experienceLow tolerance
    ExperiencedMedium tolerance
    More experienceHigh tolerance
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    Vaporizer
    mg
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    Smoking vs. eating

    When smoked, THC reaches the bloodstream rapidly after being absorbed by the lungs. With edibles, the liver metabolizes the THC — a much slower route. It can take from 30 minutes to 2 hours to start feeling the effects, which tend to be stronger and last longer compared to smoking or vaping.

    Baking with cannabis can lead to much more unpredictable results. Home cooks may be less consistent in the amount used, cooking temperatures and serving sizes.

    Store-bought edibles can be found in many forms, such as candies, gummies, chocolates and beverages. In California, edibles must be labeled with THC content in milligrams. Lab tests and measurement methods vary within the industry but these labels are one way to estimate the effects of the edible.

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    While the typical suggested dosage for low tolerance users is 10 milligrams, new consumers should consider starting with 5 milligrams, according to the Marijuana Policy Project.

      Serving size
      How tolerance may influence effects
      Weak
      Typical desired
      Too strong
      BeginnerVery low tolerance
      Some experienceLow tolerance
      ExperiencedMedium tolerance
      More experienceHigh tolerance
      mg
      10
      20
      30
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      100
      Note: Not a definitive guide. THC concentrations often vary in similar products from different manufacturers. Dosages are based on suggestions made by cannabis manufacturers and distributors such as GFarmaLabs, Goodship, VCCBrands and FlavRx.

      Sources: Analytical 360, Kushy Cannabis Dataset, Periwinkles Edibles, The University of North Carolina at Chapel Hill, Journal of Pharmaceutical Sciences, The Cannifornian and Leafly