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water bong is still contains resin, however there are pipes that heat up the weed releasing the active thc without all the side effects of burning it. the end effect is one joint = about 1.5 ciggs

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Um, no. The first studies that are being released now suggest that vapor inhaled through a vaporizer contain less harmful substances than the air in the average US polluted city. 1.5 ciggs is awful, much more of a figure linked to a small bong (i.e. less water = less filtration) or maybe a moderately sized bubbler (a handheld pipe with water chamber).