The right length for a tolerance break depends on how much you use, what you use, how long you've been using, and what you're trying to achieve. A weekend smoker doesn't need the same break as a daily dabber.

This calculator uses a decision matrix based on published CB1 receptor research to give you a personalised recommendation — along with a phase-by-phase breakdown of what to expect.

How often do you use cannabis?

How long have you been using regularly?

What's your primary method?

What's the main reason for your break?

Frequently asked questions

What's the science behind these recommendations?

CB1 receptors — the brain's primary cannabis receptors — downregulate with regular THC exposure. PET imaging studies (Hirvonen et al. 2012) show that these receptors begin recovering within days of abstinence and reach non-user levels around 28 days for heavy users. The UVM Therapeutic T-Break protocol recommends 21 days as the standard duration for daily users. Our calculator personalises this based on your specific usage profile.

Why does my method matter?

Concentrates and vape cartridges typically deliver 70-90% THC, compared to 15-25% for flower. Higher THC exposure means more CB1 receptor downregulation, which can extend the recovery timeline. The calculator accounts for this by adding a few days for higher-potency methods.

What if I just want to pass a drug test?

Drug test clearance takes longer than tolerance reset because THC metabolites are stored in fat tissue. Heavy daily users can test positive for 30-45 days after stopping. The calculator adjusts for this when you select the drug test goal, recommending at least 21 days with an extended upper bound for heavier users. Individual results vary based on body composition, metabolism, and hydration.

Can I take a shorter break and still feel a difference?

Yes. Even 48 hours of abstinence produces measurable CB1 receptor upregulation. A 3-5 day break is noticeable for light users. The calculator gives you the range for a meaningful reset — the low end of your range is where you'll start noticing a difference, and the high end is where most research suggests receptors reach baseline.

What about the withdrawal symptoms?

Not everyone experiences withdrawal, but daily users commonly report irritability, insomnia, reduced appetite, and vivid dreams in the first week. These symptoms typically peak around days 3-5 and resolve by day 14. The "What to expect" timeline in your results gives a phase-by-phase breakdown. Turn the Leaf tracks these symptoms daily so you can see your progress.

Does the type of break matter (cold turkey vs tapering)?

This calculator assumes complete abstinence during the break. Tapering (gradually reducing) can work for some people but makes the timeline harder to predict since CB1 receptor recovery depends on full cessation. If you want to taper first, the recommended break length starts from your last use.