"How many is too many?"
When the money you spend on your APVs is taking money away from other things you need/want.
It's a new hobby that you're (rightfully) excited about. Not that I'm trying to offer relationship advice, but how about trying something along the lines of
"I used to spend XX dollars a month on cigarettes, and I'd like to spend YY% of that amount on vaping to build up a collection before the FDA slams the door on vaping. I want to keep vaping so I can stay off cigarettes."
Or something along those lines.
When the money you spend on your APVs is taking money away from other things you need/want.
It's a new hobby that you're (rightfully) excited about. Not that I'm trying to offer relationship advice, but how about trying something along the lines of
"I used to spend XX dollars a month on cigarettes, and I'd like to spend YY% of that amount on vaping to build up a collection before the FDA slams the door on vaping. I want to keep vaping so I can stay off cigarettes."
Or something along those lines.