Ugh, that argument only makes sense if you're a non-smoker wanting to start vaping.
If, OTOH, you're a pack a day smoker in a place where stink sticks cost $5 per pack....
Reo Grand $150, 4 batteries $40, 50 ml of e juice $20 and a freakin' chalice $150. $360 total, OMFG! Holy Mother of God! Except you reach the break even point in 72 days, roughly two and a half months. If this setup lasts ONLY A YEAR, a smoker saves $1,465. And that's buying the highest priced RBA there is. That's not even counting the astronomical costs of smoking related illnesses that inevitably comes from continued analog use.
Funny thing is, I took my blinged out yellowjacket Grand with me into a restaurant last night, and was instantly surrounded by the entire waitstaff wanting to know about it. Oh, the disappointed, crestfallen faces after I told them the Grand costs roughly $150. Used the same analysis to explain that they've got a bullet proof long term solution that starts to pay for itself after a month of use, and half of them still didn't get it!
And everyone wonders why the US (and most of the people in it) are broke and/or in debt.
And if your spouse can't understand that argument, consider divorcing them. You'll probably be better off in the long run.