My problem is my mom keeps cigarettes at my house because she doesn't want anyone to know she smokes so it's very tempting.
Honestly, I don't think that is very fair of your mom. It's really HER problem whether "everyone" knows she smokes or not, not yours. I'm not so upset with the fact that she smokes, but my husband when through a "near" quit, where he didn't want me to see he was smoking (whether because HE felt bad about it, or more doubtfully because he smoked happily and in front of me as I was quitting-- he didn't want me to be tempted.
I told him to "Man up," that it was his life, his body, and I totally as an ex smoker understood. I did also point out that I could travel to the gas station oh, ANY time I wished. He got the point.
I might advise your mom to find some OTHER actual non-smoker to hold her cigarettes, to hide them somewhere outside (I'd think taping to the mailbox like underneath might work, that's not an area people generally LOOK at etc., but that if she wants a "concealed carry" so to speak she needs to do it HERSELF. You could also teach her to vape.
I wouldn't "hold" cigarettes for ANYONE. I am NOT that type of person. Nor as a smoker, did I feel the need to APOLOGIZE for my habit even slightly other than to kids who knew I smoked and I would simply tell them it was the worst decision I ever made. But hiding it? Come on, now.
Also, if your mother were addicted to {insert any other addictive substance here} would YOU be willing to hold on to it for her? I'm betting (well, kind of hoping) not.
I do understand the occasional deal with parents wanting/needing things and it being hard to say no.
Say no. Tell her in no uncertain terms will you "manage" her cigarette habit for her. It's not your job/responsibility/problem etc.
Anna