system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why can't we just extract THC from marijuana and sell that, instead of marijuana as a whole

I would just imagine THC would be easier for the public and politicians to get behind rather than continue to try to legalize marijuana as a whole. Couldn't THC be processed into a pill just like ibuprofen or advice and then sold as such? Wouldn't that take away the "smoker" stigma behind the use of marijuana?
gpt
We can & do.  Have you ever heard of BHO, shatter, wax, honey oil or "doing dabs"?  Those are all extracted & concentrated THC.  Normal weed is usually 15-20% THC by weight.  Extracts are generally at least 60% & commonly over 80% (the rest is made up of other cannabinoids & terpenes).

These extracts can be "smoked" (technically, vaporized), used to produce edibles or even put into disposable e-cig cartridges.

The problem with eating THC instead of smoking it is that it can take 1-2 hours to kick in, it's hard to gauge your doses and lasts much longer.  When you smoke it hits you in a minute or two so it's easy to take "just enough" & it starts wearing off in an hour or two.