From about a third mile away. I was working late as maintenance/technician at a small state of the art digital recording studio and the sound engineer had gone out to the parking lot to smoke a cigarette. He came back in, kinda shaken up, and said we should come outside for a minute. There was serious gunfire going on, "right over there", several different calibers, including some fully automatic weapons. We listened for just a few minutes, until someone said, "Maybe we should go back inside". Oh, yeah! We found out the next day that there had been a "turf battle" between the Jamaican Mafia and some Mexican Drug gang. The police reported over 200 casings found. Pretty scary, indeed.
That was fairly typical of some parts of Houston in the 80's.

Be mindful what part of the plant its extracted from, There are "Cannabis" oils out there extracted from parts of the plant that have zero therapeutic effect, inasmuch as they don't actually contain any CBD.

I have a squamous(sp.?) cell tumor in the anal canal. I am using CBD oil, keeping my metabolism in the high alkaline region, reducing sugars(my weakness, but very important, as cancer feeds on sugar) as best I can, as much turmeric as we can reasonably fit in my diet, and several other detail protocols. The Radiation Oncologist assured me that in 6 months w/o chemo/radiation treatment, I would be wearing a colostomy bag, having had my anus removed. The treatments mentioned slowed the tumor growth such that I am now at about the year and a quarter mark. What turned slowed growth into tumor shrinkage was Colostrum, a therapeutic nutrient. At this point, my major pain producer is a really bad hemorrhoid, a result of blockage-induced straining for a movement, when the tumor was largest. So, I am on the mend. You can be, too. Do deep (find the source for assertions of efficacy, and what is their reputation, source of their claims, etc.) research on the inter-tubes, find out for yourself what works.
I would like to include whole plant juice, which includes THC-a, allegedly the most potent of the cannabinoids, but I live in Texas, Goddess help me.
By the way, the Cancer-Industrial Complex is largely interested your money, without regard to outcome. Did you notice that the "10-year survival rate" is no longer used to gauge success? It was found that at about 8 to 12 yrs, cancers directly attributable to the chemo and/or radiation treatments began showing up. Now, its a 5 year survival rate.
And I am on a severely limited, fixed income, and couldn't have afforded the co-pay for the first treatment. I could see the "Doctor" lose interest as soon as I told him that.
It is important that you do your own research and decide for yourself which protocols to use.
I am not a doctor and none of the above is to imply that I am giving you medical advice.
Smoked marijuana reduces certain types of pain and elevates mood, according to rumor".
Best
The James

Edit: Watch your dose. We found out that more is not better and can be counterproductive. We reduced to just over half the recommended amount and got better results.