There's allegedly 1g in a cart for $25-$100. There's 3.5g in an eighth for about the same price as a cart, 7g in a quarter, and 28g in an ounce. So please refigure. And not all weed is sold at dispensaries.
I don't understand your point. I'm aware of the various weights to gram conversions, that's how I went from a .1g dose to (28*10=) 280 doses for an oz. You realize that dry flower is not at all equivalent to that weight in oil right? Doing a weight to weight comparison makes no sense. Do you actually smoke weed or have experience with any of this stuff yourself?
There are some poor assumptions here. The oil they're selling you is not actually cannabis oil in the sense that the oil did not come from the cannabis. That would be nice but also insane. It is olive oil or coconut oil or some other oil, known as a "carrier oil," that was heat-soaked with weed most usually in a 1:1 ratio of cannabis to oil. So, yes, as a rule of thumb, the 1g of vape juice has the equivalent THC as the 1g of weed from which it was concocted. Also, not for nothing, dry stems and leaf don't weigh anything, only the bud has heft, and that's where most of the THC, other cannabinoids and terpenes are, so the THC ratio by weight is far higher in the bud.
Just to be clear, we are both talking about vaporizer cartridges designed to use batteries with 510 connections right? The kind you vaporize and inhale, not something designed as a food additive? They look like this [1]?
The oil you see in that THC cart is NOT a "carrier oil" and is not created using the process you describe (that's how you make DIY THC infused butter or cooking oil, for use in creating edibles). It would be INSANE to vaporize and inhale olive or coconut oil. The oil in the cartridge pictured in [1] IS literally almost pure THC. Take a look at the lab report for one of those cartridges [2]. The top compound is literally THC Delta 9 (THC "Classic"), and it represents 887 mg/g (88.7% of a 1g cart) of the compound by weight.
Oil for cartridges is literally cannabis oil and is produced using CO2, butane/hexane, ethanol, or even pressure extraction. You need the mixture to be liquid enough to be wicked onto the heating element, and I'm not sure how that is achieved today, but in the past they would use Vegetable Glycerin (VG) or Propylene Glycol (PG) to slightly liquify it (the same additives used for e-cigs). If you don't include these additives, the pure oil is a solid/buttery/sticky mess, and you get things like sauce/resin/shatter.
Edit: From some search I see that coconut oil is in fact still sometimes used as a thinner, so I stand corrected there. But I think the overall point stands that it is a small (< 10%) part of the mixture, and is used as a thinner, not the primary carrier. The primary oil in the cartridge is literally THC oil.
Wow. News to me. I thought handling the pure chemical would be akin to handling nicotine or safrole, not that it'd be easily lethal, but that it would not be useful in those concentrations. Also, I honestly believed that the process would turn off the typical consumers:
Dried cannabis flowers are soaked in alcohol and then shaken gently. Isopropyl strips the trichomes from the plant. The mixture is strained into a dish and then the solvent is removed using a vacuum oven that keeps temperatures under 181 degrees. When the solvent evaporates, the remaining substance is a THC rich oil.
