the odd thing is that there are many compounds from incomplete combustion of pot that are known to be not so good... yet occasional toking has an effect that is suppressive to cancer, in addition to be not deleterious to lung function.
Ingesting or using topical tinctures has a pile of anecdotal evidence of tumor reduction, but the problem is that pot is categorized as a narcotic like heroin, so research doesn't get approved for it in the US without major hurdles. I think the pharmaceutical companies play a role in that, as it would be hard for them to make a lot of money off of something so easy to produce, sort of like aspirin.
A few states are petitioning to get the category changed, my guess is that it will happen in a few years.
There are three species of cannabis, which are cross-bred frequently. One is good old Cannabis sativa, which grows like a huge weed and takes a long time to flower, and has a moderate level of THC and lower levels of CBD. So the effects of that one alone is largely psychoactive. The other main one used is Cannabis indica, which grows in a compact form and is more potent, but heavy to CBD, so it is very analgesic and not as psychoactive, so is used for pain reduction and other medical uses.
Cannabis ruderalis has very little medical effect, but it flowers very quickly in the life cycle, so is used to breed with other types so that they produce quickly. Other species only bloom when the light/dark cycle reduces to about 12 hours of sun and 12 of dark per day, which means if one doesn't live in a warm climate, there isn't a couple months of flowering time before frost after the solstice. Ruderalis strains bloom independent of the light cycle. (known as auto-flower)
There are strains of indica that now achieve almost 25% THC by weight, which are prized by medical users, but it basically produces a couch-lock effect and pain relief without side effects. Recreational users prefer sativa, as it has a very active psychoactive effect by comparison.
There are so many compounds of THC and CBD that have not been researched fully, and when explored fully will likely yield many new beneficial uses. So far, when taken at full strength, many effects are known, such as reduced ocular pressure (that is why eyes get red) for glaucoma patients, and the munchie effect from sativa is used by some chemo patients to stabilize their digestive systems.
Getting actual rigorous data about such things as reduced or ameliorated cancers will show up just like this lung damage study as soon as the government/pharm complex mellows out and science is used instead of people's opinions and biases.
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