The saying cryptocurrency is the bubble I see is not true to what it is happening in the present. Because my point of view is that cryptocurrency will be the future of currency where people can easily exchange coin with each other without depending on an intermediary. It will be a transactional revolution, where people do not need physical money anymore.

I just tried it one time and I never using it anymore I don't know but I feel there was any problem with my lung when I used vape so I just smoke weed only )

Because it's not legalized yet. But people still can use Bitcoin as normal cause it's not banned. People often think that illegal is the same with ban, it's totally different. For example in my country, Bitcoin is not legalized yet so I can't use Bitcoin directly to buy or pay for anything but I still can use it as normal, but if it's banned I'll have to go to jail if I get caught using Bitcoin.

I'm using MEW to keep all my token for long time and everything still fine so I think it's safe as long as you keep your private key safe enough