1) Yes, most people say weed lasts longer with a vape. You get more efficient cannabinoid extraction, which means you need less to get the same effect.

2) 1 bowl = 1 pack of a vape? sometimes less. It all depends on your vape. You can almost always take multiple hits out of your vape.

3) Whether you can use vape leftovers depends on how hard you've cashed them. If they're all brown and almost crispy, nothing is left. Anything you'd make out of that will be rancid. If they're just slightly brown, there might be cannabinoids left. I'd just turn up the heat and cash the weed in the vape.

4) Many people swear that mids smoke like kind when in a vape. It's a different world. You have nothing to lose (except $150) and everything to gain by using a vape, especially with asthma.