> I'm an old-fashioned atheist but have chosen to never drink, smoke or do drugs just because I never saw a compelling reason to
I am 17 and I am the same here (atheist) and similar and yeah I see no reason to do these things either and I actively see the negative harmful effects it can have so I am not gonna do these things at all ever in my life too.
Have a nice day :)
There's not no reason to eat fatty foods (they're delicious) or do drugs (they're a lot of fun). Life is for living, too. But everything in moderation.