Why don't you just DEMAND that the nagging stop. Tell him if/when you wanted to hear anything about vaping, you will be the one to bring the subject up, until then, shut up about it, period. I am sure you'll get the shut up or what question and the answer to that is simply - you don't want to find out.
I doubt you have ever just laid anything out to him in that manner, he counts on you not being that demanding, he will use whatever to manipulate you into an answer, and that my dear is submission to a higher authority, don't give that part of you any longer.
His behavior is entirely about control, let him know with no butts about it that he is not in charge of this, you are, and you have no intent to give him that control or listen to him rag on and on at you any longer.
If he continues, you then need to assume that he's in a relationship with you to dominate you, nag you, and no matter what you do to change this or that, there will always be another something on his list to work on at you. It's obvious that you give him a lot of space and respect, but that is a two way street, he needs to make some changes in his mindset and you need to be the one to put your foot down and say no more.
Speaking straight up, straight forward is honorable, nagging is not. Since nagging is actually usually associated to women, make sure you also remark to him that he just might be a girlie man since he reverts to girlie tactics.
I would never put up with nagging or control tactics like nagging. In fact, nag me and I will be twice to three time more obstinate about my position. I also will not give in to the game of explaining myself when it comes to my choices that are about myself. You actually made a good choice, a healthier choice for you and him since secondhand smoke is considered more harmful than first hand smoke. As for money and cost, that does not compare or fails to compute when levied against the overall health issues. You would have spent X on cigarettes if you had kept smoking, you are now spending X, it's a savings in the overall once you get a little gear and setup the way you like. Maybe you should look at your old expenses and just take that amount as a monthly budget for your vape supplies, if you spend less, cookie jar it and use it as you please for you. I am making my own vape, it is so cheap to make it's unbelievable, if I did the cookie jar stuff I'd be going on one hell of a vacation every year.
When I decided to quit smoking, I bought a decent starter kit, and when it arrived I was done with smoking. I've cut my intake of nicotine down half of what it was, going down another half now, and when it hits ZERO guess what, I'm still going to vape because I am enjoying it, simple pleasure that is mine to do. My other half was so surprised, no words . . and the only words I have heard have been complimentary and encouraging. I have never heard one word about costs, none, nada, nothing, just encouragement. Even if I decided to do something risky I would be given the space without any opposition. I return the same to my other half, we have a partnership, we see life as an experience to be shared, we watch each other grow and flourish by being supportive.
CD
But when I had smoked a pack, I just flat out told him, I can't vape right now because of this ungodly dehydration, but I have to do SOMETHING, and right now, for a short time, it's smoking, so I DON'T WANT TO HEAR ANYTHING ABOUT IT! He asked me if I meant to go back to vaping eventually, and I said YES DEFINITELY, just as soon as I figure out how to do that without sending my electrolytes into complete mayhem. I'm getting more and more of a handle on that, so, so far so good.
