Are you referring to smoking specifically? Edibles with THC content as low as 1mg are readily available at shops, which make it very easy to control a precise d

Are you referring to smoking specifically? Edibles with THC content as low as 1mg are readily available at shops, which make it very easy to control a precise dose, so perhaps I'm misunderstanding. One could also eat half of a 1mg edible, which provides even more precision dosage.