marihuana and iq

Hi! Jesterday I was browsing the internet and there was a lot of topics about how can smoking marihuana reduce your iq if you are smoking it under the age of 18 (when brain is still evolving and stuff...). It reduces your iq by 8 if you are smoking it 4 days a week. I want to know if this is true and if it is how much lower my iq would be if Im 15 and I smoke marihuana once per week (or even less...click here to continue

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