no, it isn't bad in magic to smoke weed. granted, that doesn't mean you therefore should smoke weed. there's no real danger to occasionally smoking, so the wiccan reed is unaffected, but at the same time it can be dangerous so it's a grey area. personally i'm not bothered by pot use, i don't do it, mostly because i find it's a waste of time and money. it's the same reason i don't spoke cigarettes. i do know of some spells that ask for marijuana to be added, though i've never cast one. it's like any other herb, it's got it's good and it's bad, and it comes down to personal preference really.
Can you rely on the results? No, that is why it is called a mind-altering drug, it alters your mind. I do not understand how any serious practitioner would agree that someone should get high to obtain a certain outcome while practicing magick. When you are dealing with magick you must be extremely focused, level-headed, careful, and able to rely on your mind, body, and soul. Unless you can do calculus problems correctly while high, I do not recommend getting high to do magick. Lastly, smoking weed increases the heart rate quite a bit which makes it just a bit more difficult to properly meditate.
"There are also links between marijuana and other mental health conditions. Marijuana use may trigger schizophrenia or detachment from reality (psychosis) in certain people. There is also some evidence that adolescents who attempt suicide may be more likely to use marijuana than those who don't." http://www.mayoclinic.com/health/marijuana-and-depression/AN01900
Marijuana is not harmful and it depends on the tradition. Some stray away from any form of drug use to keep the body pure. Other traditions use psychoactive drugs as a way to access other spiritual worlds.
I don't think weed has to do anything in religious matters just physical ones. In fact indians and ancient greek seers used to inhale something hallusinative sinc they claimed that it helps them with having vissions in the future. Although they didn't know its real effects. I wouldn't recomend it not because of relegion just a typical thing about health issues.
I don't know what you guys are smoking, or where you get your information, but marijuana is an herb, medicinal at that. From legal standpoint, it's a controlled substance, not a drug. As a medicine, it helps relieve pain, relieves nausea especially on those who are in chemotherapy for cancer. Helps with those who have trouble eating. Also for those who have trouble sleeping. I fully promote the legalization of it, as it will help many people.
And it's not just the medical field that will benefit. Did you know that the plant itself can be grown to replace the trees being cut down for building. Hemp grows so fast and has longer fiber in it than any wood. All the things that can be made with this plant, how can it not be helpful. No tree ever need to be cut again! Can be made into paper, clothes, medicine, how can it not be helpful. Taxing it is their problem. But if they get it right, the deficit would be paid! Fuel can be made from cannabis, did you know that? What a versatile thing we have in front of us!
The worst thing that makes hemp, it forms a psychic dependence of man, especially a teenager. Guys you can not smoke as shamans, Indian magicians, African sorcerers. Why do you need? Do you have a different lifestyle and mentality. You do not have such a spiritual development. Drugs will kill you.
I've read a fair few posts on this subject. And I would like to clear a couple of things up. Firstly "Weed" or Marijuana is the cousin of HEMP it is not the same plant and will not give you a high, the levels of THC in are so low that even if you smoke an acre of HEMP you still wouldn't get high. HEMP is a very versatile plant and one of the GIFTS of nature. It has over 25,000 uses and is extremely environmentally friendly and as well as being a superb rotation crop. I could talk about HEMP for hours and pages.
In regards to "weed" depending on what you smoke will depend on your bodies reaction. Today, there are so many different types of Grasses out there that you have to be extremely careful one may give you bouts of paranoia while another will just simply put you to sleep. "Weed" as many wonderful medical benefits but because it is banned in so many countries it is grown and cultivated by people who wouldn't have the best interests of the consumers at heart - its not like we have a quality control on this drug I stress you have to be very very careful about what you smoke.
Having said all that - there are many countries in the world that have smoking marijuana is very much part and parcel of the culture and tradition. It is fundamentally a herb and therefore should be treated and given the same respect as any herb. It is one of gifts of nature. It was banned by the industrialist and the church. Alcohol is a greater threat to your health than "weed" Weed by comparison is harmless.
Ok so here's my final thought. Weed is bad for your health. There are so many cons that outweigh the pros. However, it can be a spiritual aid. It helps with divination and connecting with nature. It is essential to certain paths and faiths (Rastafarians)and it promotes psychic awareness. I do smoke from time to time. It helps me meditate and loosen myself up when getting into the magickal mood. I do not promote its use and I will tell you this. It is a drug and any drug taken in mass quantities can hurt you. If you take too much DO NOT astral travel. It may cause you to go astray and we all know how dangerous that is. Weed also degenerates your mental defenses/capabilities. So the choice is yours