Ragweed is Not the Only Weed to Cause Allergies

Just like ragweed and birch trees, marijuana plants may trigger allergic reactions in some people, according to a new review of previous studies.

And because of the increasing use and cultivation of marijuana that has followed in the wake of legalization in some places, allergies to marijuana may be on the rise, experts say. People can be allergic to the plant's pollen, or to its smoke.

"Although still relatively uncommon, allergic disease associated with [marijuana] exposure and use has been reported with increased frequency," wrote the authors of the review, published March 3 in the journal Annals of Allergy, Asthma & Immunology.

(Source: Livescience)