You might want to look at getting one of these: http://openvape.com/

It's very discreet and pretty effective, esp. if you are looking for a more CBD non-thc delivery method.

Unfortunately these are a local Denver product right now from what I can tell (my friend in SF can't find them their yet outside of driving to Berkley); so it might be difficult to find outside of colorado. They also make a variety of cartridges including Sativa, Indica and Hybrid.

I've switched to using this most of the time esp. outside the house, or when the kids are around. When you exhale there is hardly any smoke either and I've seen people smoking these at bars openly. I haven't been so bold even though I have a red-card, things sure have changed fast, at least in Denver.

Edit: Also, the high effect is minimal, esp with the Sativa cartridges. Much more of a body, pain reliever type effect.

Edit 2: Cartridges are rated for around 300 hits, and at 40 dollars per that works out be a pretty cost-effective solution from a cost standpoint too. This might not be as effective as a mj joint however; I would be curious to know if you get one if it's more or less effective.