… I got a Silver Surfer...no bag attachment but works great.

is excellent. They have a less expensive model (non-digital) that works just as well. The bag is large but holds the vapor until you require it. It is far cleaner then smoking and the vapor is not at all like the smoke that stinks up the place. Can be used with oils. It is VERY expensive but captures 100% of product so can save costs in that end. Also, very easy on the lungs, the main reason my friend uses it.

All he has used for many years.

He got a used one on craigslist a lot cheaper than retail.

Some people use one. (I had several beers and knew better than to imbibe)The bag was huge and they all had a puff. I have issues with putting my lips on something that has been on someone else's lips... you don't know where their lips have been.

You don't have to inhale the entire bag in one hit. LOL. And vaping is a little different from smoking. It gets you higher but it doesn't last as long. So you might need a little more than you think you do.

When the bag is filled how long do you have to use it before it dissipates? Or does it?