so my brother was over last night for a visit and he's a smoker....

@beermeplease i actually remember you saying you quit cold turkery. This new info changes everthing.

i would like to resubmit my answer changing it to [i]give it back to him[/i].

You need to give him back the cigarette and as you pass it to him talk about how your mother died and how painful it was to see that for the both of you .

hand him that stupid cancer stick as a symbol of him owning the process of smoking until he dies like your mom did (sorry for your loss) or makes a drastic change (which may be too late) to attempt to thwart that ending.