Yes. It should be as acceptable as if they drank a glass of wine
Currently, of course, it's not ... but that's due to the stigma attached to marijuana vs. alcohol, and that's why a lot of the posters here are getting so worked up and emotional about it.
One of the main reasons that marijuana was banned was because the earliest vehicle engines ran on hemp oil, and Jєωιѕн Rockefeller big oil had to suppress it so they could sell their oil. Even now you can, with the right conversion kit, turn almost any diesel engine to bio-diesel (running on various vegetable oils).
Meanwhile, Big Pharma could put THC in pill form, add another ingredient or two, patent it, charge $400 per dose, and it's suddenly sanitized and acceptable.
People have been PROGRAMMED.
Do people know that both Pope Leo XIII and St. Pius X drank cocaine-laced wine? Cocaine was not yet illegal. Pope Leo XIII was particularly enthusiastic about it (brand name Vin Mariani), to the point that he awarded a Vatican medal to Angelo Mariani and allowed his likeness to be used in advertisements for it. He credited it with the energy he had, reigning til the age of 93 and having written 88 encyclicals (of the 300 total ever written by popes). I wish I could get my hands on some of that stuff, or the original Coca Cola.