Iirc inhalers are direct-to-lung, smoking weed is mouth-to-lung. Use your mouth as an antechamber for the smoke and then inhale it down with fresh air, hold for 5-7sec, exhale, repeat if necessary (don't over do it, can always smoke more, can't unsmoke that last hit.)

It also isn't that unhealthy. And if you vape or eat it instead it isn't really any unhealthy. As for "why" only you could answer that, you do you, I'm just spreading info.