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It can. It largely depends on the type of cannabis and how it is ingested. Inhalation tends to raise blood pressure, vaping will have less effect. You may experience a short rise in BP and then it should drop as you progress through the high. Consumables can decrease BP. These are generalizations, though. People with pre-existing conditions may have entirely different reactions and further research is needed.
In most cases where high blood pressure is diagnosed, the cause remains unclear. One review paper in the International Journal of Hypertension explains that this accounts for around 90% of all hypertension diagnosis and is usually referred to as essential hypertension. Secondary hypertension is diagnosed when a cause can be identified. Potential causes of secondary hypertension may include: 

All of these steps and techniques are things you should ask your doctor about as part of your personalized health plan. Preventative care from an experienced physician is the best way to fend off many health problems, and hypertension is no exception. Find a skilled St. Joseph Health primary care physician or heart specialist using our online provider directory. Download our health numbers report card to help you track your blood pressure and other common markers that measure heart health.
The American Heart Association considers 120/80 to be a normal blood pressure reading. Unless you have been diagnosed with high blood pressure you may not realize anything is wrong so it is important to get tested each time you see your doctor, or more frequently if you have a family history of hypertension. Often, hypertension has no obvious symptoms, but it could be quietly causing damage and threatening your health. This condition overworks the heart and damages the walls of the blood vessels. If left untreated, it can lead to tears, ruptures, or increased plaque build-up in your heart, which increases your risk for heart failure, heart attack or stroke.
Consider once again the analogy of the garden hose. If you turn on the water “harder,” there is more pressure in the hose. Excessive salt in the diet can result in excessive fluid volume in the blood, which results in elevated blood pressure. This cause, too, is reversible, as a plant-based diet of whole, natural foods, devoid of added salt, is naturally low in sodium chloride.
Studying men with hypertension who came to Pritikin, scientists at UCLA found that within three weeks, the men had significantly healthier levels of blood pressure. In fact, those who arrived at Pritikin taking hypertension drugs left Pritikin two to three weeks later no longer needing their medications, or with their dosages significantly reduced.1
One of the most important lifestyle changes to adapt when hypertension affects a patient is a more active daily routine. Exercise is reported to be an exceptionally useful method for controlling blood pressure levels and for reducing blood pressure in patients diagnosed with hypertension. Additionally, patients who regularly participate in physical activities are also at a lower risk of developing a complication or complications due to high blood pressure.

Olive leaf extract. In one 2008 study, supplementing with 1,000 mg of olive leaf extract daily for eight weeks caused a significant dip in both blood pressure and LDL ("bad cholesterol") in people with borderline hypertension. If you want to incorporate olive leaf extract as a natural adjunct to a nutritionally sound diet, you should look for fresh leaf liquid extracts for maximum synergistic potency. You can also prepare your own olive leaf tea by placing a large teaspoon of dried olive leaves in a tea ball or herb sack. Place it in about two quarts of boiling water and let it steep for three to 10 minutes. The tea should be a medium amber color when done.
2. Take the right nutrients. Talk with your chiropractor or other healthcare professional about the wide range of well-studied nutrients that, along with dietary and lifestyle modifications, can help normalize your blood pressure. One meta-analysis found magnesium supplements could lower blood pressure. Likewise, researchers find a small but significant decline in blood pressure for people with hypertension who use fish oil. (You can get all of fish oil’s benefits combined with anti-inflammatory flax oil and GLA in our Optimal Omega.) 
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