How Long Does Hash Stay in Your System?

dropper of hemp oil on a countertop next to lemon

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Hash or hash oil may be used as forms of medical marijuana and may be allowed in states where marijuana has been legalized. It can be used in preparing edibles, smoked, or ingested in other ways. The psychoactive ingredient in hash and marijuana is tetrahydrocannabinol (THC).

Here's how long the THC from hash oil stays in your system and the factors that influence this.

Hash, Hash Oil, and Weed

Understanding how hash and other forms of marijuana differ is part of knowing how long it will affect you. Weed is essentially an unprocessed form of marijuana, which includes the leaves and buds of the Cannabis sativa and Cannabis indica plants. The only preparation of weed is drying the leaves and buds.

Hash, which is short for hashish, is a preparation of marijuana made from the resin of the buds of either type of the Cannabis plant, which is extracted with solvents. Hashish oil, or hash oil, a concentrated form of cannabis oil, is the strongest form of marijuana since it's so concentrated, with a pound of marijuana yielding just an ounce or two of hash or hash oil.

Since the processing of marijuana into hash oil isn't standardized, even in legalized production, it's difficult to know just how much of the active ingredients are present in the hash oil. It can contain anywhere from 15 percent to 60 percent THC.

How THC Affects Your System

THC enters your body's bloodstream rapidly after smoking marijuana or hash oil. You feel the effects within minutes and they peak in about 30 minutes. If marijuana or hash oil is ingested, such as in baked goods or edibles, it takes longer to be absorbed into the blood, usually from 20 minutes to an hour and a half.

Once in your system, you may feel like the effects have passed after two to three hours, although there can be some impairment for as long as 24 hours. The time frame is extremely variable. It depends on the concentration of THC, which, as noted before, is not standardized with hash oil, even where it can be produced and purchased legally.

The effects of THC on attention, concentration, and working memory generally have passed by six hours after ingesting or smoking THC-containing products if you're a light user. Your psychomotor skills are affected during this period, so you shouldn't drive or operate machinery. In a traffic stop, you could be charged with DUI, even if you have a prescription for medical marijuana.

If you're a heavy user, there can be residual effects for as long as 28 days after you stop using THC-containing products.

Side Effects

The physical side effects of hash oil include:

  • Increased heart rate
  • Red eyes
  • Dry mouth
  • Increased appetite
  • Vasodilatation, the widening of your blood vessels, which decreases blood pressure

Due to the uncertain concentration of THC in hash oil, you should be cautious about the amount you take for medical purposes. Taking a large dose may result in these side effects:

  • Hallucinations
  • Paranoia
  • Altered mood
  • Memory problems
  • Anxiety
  • Altered sensations

Fortunately, these effects will wear off over the course of a few hours.

Drug Interactions

Drug interactions with other substances include alcohol, which should be avoided. The THC in the hash can interact with a number of medications such as blood thinners, anti-anxiety medications and more. If you are on any medications, discuss your use of hash oil and other THC-containing products with your doctor as it may influence your dosages.

How Long THC Stays in Your System

How long THC stays in your system depends on a variety of factors like age, weight, amount of body fat, how frequently and how much hash you use, and your metabolism. Some of the THC in your bloodstream is rapidly metabolized into over 80 different chemicals, known as metabolites. A portion of these are then excreted in your urine.

But THC and its various metabolites are also stored in body fat and these remain in your system for much longer. These metabolites accumulate, so if you use hash or hash oil every day, you will have more stores of THC in your body and it may take much longer to eliminate them from your system.

Some of the THC is stored unchanged, so when it's released from fat into your body, it can again exert its psychoactive properties, as well as be metabolized and excreted in your urine. The half-life of fat-stored THC is about 10 to 13 days, meaning there is half of the original amount left at this time.

In general, the detection windows for THC in a urine test can be up to the following amount of time:

  • One use: 3 days
  • Moderate use (4 times a week): 5 days
  • Daily use: 10 days
  • Daily use over an extended period of time: 30 days

THC can also be stored in your hair follicles, where it may be detected for up to 90 days. This long elimination period is of concern for a medical marijuana user who may need to take a urine drug screen.

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Article Sources

  1. Sharma P, Murthy P, Bharath MM. Chemistry, metabolism, and toxicology of cannabis: clinical implications. Iran J Psychiatry. 2012;7(4):149–156.

  2. National Institute on Drug Abuse. Effects of Marijuana on Brains and Bodies

  3. Oberbarnscheidt T, Miller NS. Pharmacology of Marijuana. J Addict Res Ther S11:012. doi:10.4172/2155-6105.1000S11-012

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