Wendy --
This thread was really interesting to me because I have smoked American Spirits for the same reasons everyone else started smoking them -- thinking that they contain less harmful "stuff." Until I read this thread I didn't realize how disingenuous the A.S. marketing campaign is...FROWN
I can certainly sympathize about having to deal with irritating know-it-alls. People like that cling to their inaccuracies for dear life. The closer they are to realizing they're being proven wrong, the more face they must save, and the harder they cling. It's often a losing battle. Better, perhaps, you should try persuading your brother instead (and maybe in some place where his wife isn't available to interrupt and side-track the discussion!).
Two thumbs up to another participant's suggestion about providing your brother with a filter that can demonstrate -- graphically -- part of what's coming out of that smoke. I was once flamed a bit here for supposedly "spamming" the forum with info about a particular filter, but I'm going to post about it again -- with a disclaimer that I have NO connection to the company in question except as a user of their product (and no interest in promoting smoking or tobacco products!). The product is called "TarGard" and is available both from on-line vendors and the manufacturer's own web site. I won't post the link (in case that is against the rules here) but a Google search for targard will turn up the site quickly. (There are other such products that can be found at smoke shops. I tried several; I ended up preferring the targard.)
I'd strongly recommend getting the clear disposable filters rather than the opaque white ones. After only one cigarette has been filtered with that thing, your brother will see how much tar or other brown gunk was trapped within it. I'd begun wanting to quit tobacco and really wanted to quit after being shocked big-time, seeing those little "ribbons" of tar trapped in the filter. At about that time I learned about e-cigarettes -- fortunate timing...
Once your brother understands how much gunk is going into his lungs with each regular cigarette, methinks he's going to have to get a bit tough with his wife. Whether or not future research finds something not entirely healthy in e-cig vapor given current e-liquid formulations, still there's no way they could be more harmful than cigarette smoke! (As with another participant here: I don't order my wife around and would be big-time ticked off if she tried to do that to me!)
Mike