I have heard of people using tinctures, Marinol (the pill), vaporizers and such.
The question for him is what part or parts he likes best about use.
Vaporizers, edibles, and pills, are said to have a more chemical or pharmaceutical feeling, or a different high. CBN CBC and THC are the main things in pot that cause the "high." In forms other than smoking, the end result is a more pure method. Edibles are MUCH longer lasting, and more intense than smoking. Caution is advised.
Actual smoking, whilst questionably bad for health long term, delivers the same CBC CBN THC etc., but with the traditional "high," that is different and enjoyable on multiple levels. More chemicals are introduced to the body, via lungs.
Legal note, using any chemical to process/concentrate the pollen/keif/crystal glands is a felony in America, and probably many other countries! For example BHO, or butane honey oil, is not legal under any legitimate circumstance, even from a dispensary and possession can be prosecuted more harshly than simple dried plants. Same with isopropyl alcohol, and any other chemical methods. Chemically Refining the substance moves it into another category.
However, hash made through water or dry extraction methods are legal (in California, etc.)
This dry concentrate is the THC glands/ crystals/ keif compressed or heated together, or dried with water methods.
This is the same feelings, without all the harmful useless plant matter burning and putting extra tar into the lungs.
Does he have a silk screen style keif box? A container with a fine metal screen that allows glands to fall off plant matter passing through the screen, but blocks leafy plant matter, thus dry extracting the pollen/keif/ glands from.
In addition. People have been using cannabis since before the Egyptian Pyramids were built. For medical and other purposes. Hemp rope is some of the best in the world.
Best wishes and welcome aboard