Vaping in Japan Airports

Hi,
In a couple of days, I make a business trip to Indonesia through Japan. I will stay in Japan for 2 days. My question is whether it is allowed to vape in Japan airports (hotels) and in Japan in general? I worry about this as I've read on VapingDaily that vaping is illegal in many Asian countries. In addition, can I buy any exotic e-juices for my Juul? I would like to try some :)
I would be very thankful for clarifying these issues ))

Vaping is in fact legal
But you cannot use it since many area in Japan are smoke free areas, this include vaping.

There are dedicated areas but I dont think other people will like if you are going to vape in a small area.

Don't vap in no smoking areas. Simple.

Thank you guys! I will consider your recommendations)
Hope, I won't be fined)