Allergic reactions to pollen from cannabis plants are on the rise, according to a new study from the American College Of Allergy, Asthma and Immunology.

The report, published in the school’s scientific publication, found that 73 percent of the 50 million people who have allergic reactions to other kinds of pollen also react to cannabis. 

This means more than 36 million Americans could have cannabis allergies, even if the smoke is passively inhaled, say the researchers.

In some cases, researchers found exposure to cannabis pollen or smoke triggered symptoms of allergic rhinitis – caused by inflammation of the nasal passages – which resulted in sneezing, congestion, itching and a runny nose. They also discovered symptoms of conjunctivitis and asthma.

For those with serious allergies, simply touching the plant can lead to hives, itching and puffiness or swelling around the eyes.

Like with any other allergens, the researchers say people who are prone to reactions should avoid cannabis. If you’re someone with a history of anaphylaxis, they recommend carrying an EpiPen just to be safe.

h/t Daily Mail