Here it is straight: Plants can't use sugar as a nutrient, so forget everything anyone tells you about the buds tasting carmely, or having a sweeter flavor from adding sugar. There are natural sugars present in molasses. Along with that molasses has an assortment of micronutrients, many of which beneftit the plant. the sugar will be consumed, digested, and released as waste by natural bacteria that are present in your soil. Some of these are nasty and will harm your plant by making the soil an unstable place to live. Others are crucial to your plants health, and the byproducts of the digestion proccess will promote viable soil, and conditions ideal for nutrient uptake by the roots. Plants that show improvement from molasses use over those that don't get molasses are just showing an improved health and vigor from the resulting improvement in the soil condition. In addition, if any of the micronutrients that are present in natural molasses were in short supply, the plant is able to utilize them. Google "mychorrizal fungi". It'll make more sense if you understand it.