The pax is a waste. I bought one a while back, it's definitely not discrete. I remember going to the movies and using it in the car before hand and it reaked.
Yours must have been broken or something. My homie's in Seattle worked great. No vape is going to totally take the smell out of your exhale, though.
Doubt it was broken brand new out of the box but still possible. I think it was either because I had it too hot, or because I let it sit in the glove box without clearing it out before going to the theater. Probably the latter.
There was a bro behind me in line at disneyland last time I went and what ever vape he had was stealth as f. I think it was an oil only pen. I've tried some of the pre filled pins and they are definitely incognito.
Those are by far the best, as far as stealth. But that's with the oil, which makes a huge difference.
Check out the micro G pen. Its about $70, small and works great. Looks like an ecig. No vape pen is perfect yet but I like this one a lot, use it all over town and have it in my pocket right now. Smell wise is dependent on your product, some concentrates stink and some dont, but non smell near as bad as weed itself. Depends on the age of the material and the process being used. I like the oil smell, its so much sweeter and less invasive.
Those things were like 10x more expensive than smoking cigarettes for me. However they served as a valuable bridge for transitioning from cigarettes to not smoking at all.