AT&T Park banned ecigs and any kind of vaporizers last year, in addition to adding metal detectors at the entrance, as all MLB parks will do, I believe. I have mixed feelings about ecigs. There seems to be a gold rush going on with various retailers self branding cheap components and marking them up considerably and making specioous claims regarding their capabilities, such as saying that they will vaporize dry herb. Witness the notorious Atmos Raw. Unfortunately this has stigmatized legitimate manufacturers like VB and retailer Vapor Warehouse, which seem to me to be forthright about the benefits and limitations of their device. My fear is that they get thrown under the bus along with the less scrupulous companies. I have noticed that in the Bay Area that ecigs for many people have become almost synonymous with vaporizers. Several stores that call themselves vaporizer shops sell nothing but ecigs.