Its obvious that any mid-strong psychoactive sustance long-term use/abuse, will change the results in the IQ tests, generally, maybe lower results, becouse the IQ test are mainly about logic.
Visual then "sensorial?" logic, problem ressolution via logic non-complex process, not learned knowledge.
I have a VERY high IQ, well... i took 5 different tests in 1 and a half year, that was when i was about 15, exactly when the drug and alcohol use/abuse, always taking so much care and knowing my drug and my body, but commonly abusing them at high doses, or very commonly in high dose combos for days in a row, then polydrug addiction for years.
OFFTOPIC
Until today... still using almost daily methamphetamine, im proud of my dosage reduction, i have 18 months "reducing" my dose, and yes i was using almost a gram daily of extremely pure meth (my city is one of the golden triangle of the worldwide illegal drugs commerce, and administration of the production at other areas of the globe, so, its sad, and disgusting, that illegal drugs are very easy to get here, really easy, you see the dealers in local commerce houses with slot machines to bet with real money, 4x4 and all-terrain vehicles, 5 motorcycles outside, ad few guys smoking weed or drinking at the night, open 24/7, i will take a pic of the point nearest of my house then open a new post to stop divaguing here for educational and etretainment prupose to show peculiarity of drug selling in my town. -THE MSG IS CUT HERE, i will continue later in another thread.)
Well, i will do another one when i get clean of high doses of amphetamines, but even with my hardcore 15 years of abuse of my mind and body, without being a total careless, but fuck, i survived strong cocaine-alcohol overdose at the 19s, triggered by uknown but good quality coke 3,500 mg insulfated in less than a min, that disconected me out of the world, and i can do another post about this shit later too lol, incredible how i got lucky or grated to get the god power to let me continue alive without any consecuences even when i never go to an hospital at this, my hardest overdose, not the only one).
Of course that my cognition and person is deteriorated becouse all that, and got much more deterioration at the moment of change my lifestyle, i still have tons of stress and mental problems when im being a productive functional and reincorporated to a different social group, even after that, nowadays i learn daily hearing ebooks, news, studies, forums, at the same time i do bored work, and when im free if im not playin poker, im estudying it, or learning more when i do useless things or domestic bored needs).
I didnt got my biochem engineer title, but i studied for years it and abandon becouse i was making profits in a business, and young plus stupid to think that will last the rest of my life, and becouse my left at the university wasnt formal, i literally just stopped to go at school, and years later they informed me about the procedures at this cases, i cant get back in to complete my studies, but they validate all of them and gave a partial title, that just help a little to incorporate another university and dont repeat with luck 8 months of 4 yrs at study, a useless partial title.
At that moment, i was polydrug user dependant, but i always wanted the balance to let me enjoy and do my school works, being one of the best students of my group, with high general results and super downs when procrastination was the problem, not the lacking of study or practice, i still use to learn skill fast when i put attention and im interested in that, so, this is what the IQ try to emulate, its for me not near intelligence or logic hability, is more like a flexibility of the logic mind process, cuz you have time limits, and is almost sure u will not end a IQ test with time limits, more points the faster you solve the problem, yes, it starts with visual logic excercises, but when you got at the 20 last questions, you can see the deepness of the problem and how every posibility can be a perfect answer, but then, answer speculating to have solved all are ok and explain to yourself why, shows that you havent solved anything yet.
iQ test are little... extrange, far away to determinate the succesfull possibilities of anyone on the life, or the professional successfull and quality of a future professional if they are in the regular iQ results, so, high iQ doesnt determine intelligence at higher scores, is something more, study yourself and you cand see what helped you to get that iQ then discover shit about your akward thinking process lol, that is more funny and makes me .. happier?, i feel i know more myself and understand related things i have done, thats not related with intelligence or "correct" logical resolution, more like flexibility between logics and give value to things that dont have any value, but that random value then play with them... duh its so bored to make exams of hours.
i will do a test when i got more equlibrium at my life, and got more health in general, i didnt take care of me for more than a decade, but still developed skills and have done things that even me didnt want i will got at that point, offering high value as associate or non direct employed, or independient, until nowadays, i have my own business with a brother thats an angel cuz becouse my procrastination problems, i would not do things at time, still i commonly do the works at the night before the client will go and complete the paymets, and they go very happy and come back so we have lot of work well paid, but he supported me when i wasnt able to work, specially cuz my shitty mental health, or few times when i didnt give a fck and go to a binge of 2 days with a girl in a hotel, or maybe guys? lol, forgotting i had professional compromises to do, after good customers get angry and talked to me about that, and even my family, i never understimate the importance of the service im offering, becouse literally can stop a big business to work, or a goverment public activity can not start until i had my work done, the second one didnt happen cuz the pressure of procastinate wass much less when i know i can get angry such important powerfull people (not smart maybe, but with a big ego and power, and money, but smart ppl get advantage of my fails, and i cant identify them, until their arguments and actions gives positive result even with my foult, in any way that can be done, specially economical).
Well.. if like Arrall, i take that studies with minimal importance cuz the multifactorial involved non studied non known or not reported by anyone, or event didnt care, can be factors to determinate a lower iQ, situations that can be prone in weed users, or maybe not....
After the low of integrity of the studies, plus my opinion about IQ test, more related to determination, competitivity, flexibility, awarness and desire are some of the ones that leads to the higher iQ levels, and logic brute process are the scores under 110 of a 120-140 test.
If much, that would be understand as weed can give you a slower logic brute process skill, not lack of the skill, cuz you have to solve the faster you can to know your real iQ level, that needs mental and physiological preparation, and is maybe weed make ppl more prone to get all that factors in a optimum state before the exam, or... maybe is cuz ppl are in that studies doing that test becouse of the MONEY that will get at any result, not with a purely interest in know accurattely whats the iQ test result for personal reasons that lead to make the effort and mind state needed for a good evaluation.
All that points, just resumes that, the scientific process is commonly ignored, integrally, and using techniques like double blind, argument their studies are valid, but any case have their particularities, and in this one, its a shame study of im sure average iQ people, that doesnt even think seriously at factors i have descreipt, and dozens of other ones that i cant imagine, but a group of sciencist yes, and give an importance, then discard or give a value at the studio, its all generalized in ages, education levels, even at races lol, tons of studies are focused on races at the diversity of samples, ye, genetics play an very important role, but in that studies, obviously endeaivour and beliefs take a strong importance over genetics, and there ones are ignored, yeah, its easier to get the results wanted using selected criteria, that its scientific, but imho in a hypocrit/lazy-science, a little more interested in reinfore their group affirmations, to get an economical benefit, that clarify complex things that will lead to non conclusive at all results, and maybe low or no remunerated studies, with a highly scientific procedures and ethics.
So... thats complete BS, mainly cuz the title, the redaction, and the partiality of the claims, combined in iQ as a SUPEROVERESTIMATED test, that most ppl even relate it with inteligence or success, and how that things are important for society, for me is more a fancy test than a scientific one, and any study like that, focused in iQ linked Cannabis usage, its a shame and waste of time and money.
I dont need a study, i have common sense, experience, and naturally can randomly say that yes, IQ WILL DIMINISH in cannabis users, acute dose, long, term, rehab and sober, any of them, will get lower IQ, 1.- cuz they are OLDER months or years, 2.- cuz i know very good the effects of cannabis, the after clean changes in cognitive process, beliefs and habits, for good or for bad, and even if the changes are for good, i highly speculate that maybe 0.1-7% cannabis users will preform same or better at a test after one month/week/year of use, and the rest 93-99.9 will improve worse, its speculation, just things i speculate to show that without that wastefull studies, we already know cannabis will worse IQ results at mostly cases, becouse of the nature psychoactive strong sensorial and perceibed changes, and the envoirment that develops changes too with a person smoke weed, with all the people around demonizing it, or changing their envoirment if thats not under professional control, even a long term non ambulatory study, the high controlled professional envoirment can alter for bad the results of iQ.
And... who gives a f about 10 iq points? i have other 10 to waste if u want i will be over average yeeeah lol, joking, but... iQ is a test, that is far away from real important things in succes, like conciense, character, skills, ejecutive hability, social hability, intrinsecal emotional process, non-concient process of daylife situations and feelings, general mood, that imho all are altered by weed, for good or for bad, and honestly, i trough years have seen a balance in pros and cons, with much more pros in specific situations, of do weed to optimize the previous factors wrote.
Anyway ye weed prones you to have less iQ, i dont need a study for that, and i know there are MUCH MORE things that doesnt need to be consumed daily to destroy your iQ, maybe a loved one death, maybe a rupture relationship, maybe a comment that maked you frustrated and lowed your self steem a little but very deeply, that shit will destroy your iQ, 7 points is a joke, and scientific are more worried about the weed?...
Pseudo-scientific, the partial ones, using the scientific method, without any ethic.