Hard to say, it's only one side of the story. Some parents are more strict than others, everyone is different. If 18 and an 'adult' by status and not happy with the living conditions at home, time to move out and find a place of your own where you can enjoy your freedoms. As many say, 'their house, their rules'. There's no real way people 'should' be treated given a particular age unless of course they're equals. Hard with parents, just my opinion but parents should still be respected unless they're way out of line (abusive, criminal etc). Living under their roof isn't really 'equal', it's living as a kid but expecting to be treated as a peer.
In general it's good you gave up the cigs for vaping, it's healthier in comparison. Not really for me or anyone else to say what's right or wrong, my words are purely opinion. Sounds like your dad just wants to set rules to keep you on track, probably because they care. If they didn't they wouldn't say anything and just let you do whatever.
That's not how real life works though and even adults can't really do 'whatever' they want. If living in a community I can't just play my music as loud as I want at 3am, someone would complain, call the police and the police would arrive informing me I'm disturbing the peace and turn my music down. If I refused to follow the rules they'd punish me by writing me a ticket and potentially taking me to jail. Of course that depends on local region, legal issues and won't necessarily apply everywhere (not sure where you're from, different state, country than what I'm accustomed to).
Basic words of wisdom I can offer, so long as you're living there under the roof they provide, benefiting from their work/provisions, you're obligated to follow their rules. Adults get along when not telling each other what to eat, when to eat, how to clean, when to clean. They live in separate housing they provide for themselves and get to make their own decisions in that regard. Usually they meet up for brief visits or to share a meal at a restaurant and so on. Similar to smoking, some people allow it and others don't. I have family who doesn't smoke/vape/drink alcohol. I'm welcome to visit but I can't just chuck clouds in their living room. Their house, their rules and if I'm their guest I should respect them. Go outside to vape. At my house I can vape all I want. These type of 'rules' or courtesies still apply even though I'm nearing 40yrs old and family are in their 40's - 60's. It's not just something that applies to kids or young adults.
It's not even a matter of being treated like a 'kid' vs an 'adult'. It may seem like that right now but your dad's actions are actually treating you like an adult. Adults typically lend each other a certain amount of respect and disrespecting others can be seen as bad form. As an example, one adult invites another to eat dinner with them. Generally there is a time set and agreed to, maybe a pleasantry of the guest offering to contribute to the meal. Unless it's a close friend or family and a special relationship where you're welcome to stay as long as you want, it's bad form to stay too late into the evening. It's also bad form to invite half a dozen friends to join in and get drunk when the host didn't invite them. It's impolite and the host should be respected. For now your parents are the hosts. The real issue may be the eagerness to make a distinction between being a kid and looking forward to passing over to status of 'grown up'. It's normal but being an adult isn't all it's cracked up to be sometimes lol. As a kid I couldn't wait, now I look back and can't figure out my big rush. Best of luck to your situation.