It turns out that, prime weed might be giving you man boobs. A study on animals has shown that THC exposure, found in all our favourite buds, reduces testosterone, makes your testicles smaller and can cause abnormalities in your sperm.

Plastic Surgeon Dr. Anthony Youn warns that marijuana could possibly also cause someone to grow ‘man boobs’. Known to medical professionals as ‘gynecomastia’, man boobs are caused by fluctuations in the hormone levels that THC can affect.

According to the plastic surgeon Dr. Adrian Lo, a specialist in breast reductions on men at Pennsylvania Hospital, a third of his patients are marijuana users.

Studies so far however have only shown these problems in animals, so whether the effect is as pronounced in humans is hard to say. Due to the restrictions on clinical trials involving cannabis, it could be a long time until we get an answer.