There's less THC loss with vapor vs. smoke. There's also a loss of toxins that provide the sleepy effect you get with smoke. So the vape high is a more alert one. Most people say they use less weed with a vape. If smoke disagrees with your lungs, and it does with me, you probably use more with a vape. I get better effect from vaping than I have for years with smoke. I generally don't vape just before bedtime though, since I just end up staying up later. The 'ready to crash' feeling doesn't come around until I'm coming down.