Well Lithium put it VERY clear, and i agree with him, I didnt had any problems with customs or vaping in the street.
Now, about customs, before i bought my gear (sexy Radiohead Chuck+attys+batteries+juice+carts) i asked a friend i have that works at customs in some point of Sonora and she said they dont even know about e cigs, they dont have any kind of orders to take em away and up until i mentioned e cigs to her she didnt even knew what one was, so, it should be safe to pass your gear along, BUT! becareful, i THINK it should be safe AS LONG as your quantities are somewhat low and you say its for personal use.
The authorities dont give a crap if you use e cigs, they just want money and if they label you as a supplier theyll either take your stuff away or ask for a bribe (which nowday its a bit harder since there is new staff at the customs point), i dont reccomend a bribe btw.
About the juice, you should be able to order 2 30ml no flavor EXTRAHIGH mg bottles from International suppliers, should be ok, i havent been able to find Lorann suppliers in Sonora but there is a supplier in Nuevo Leon, so its very easy to make your own juices, USP VG should be available at any pharmacy (or at least it is at the one i go to which was the first and only i tried) and so is distilled water, i havent searched for PG but im not interested in it anyway, STILL you should be able to import it, that has NO BAN whatsoever, and as i said, neither Lorann flavorings, so, as far as juices go, we are good to go.
If you are importing any kind of gear ask your supplier to mark your package as "Gift" and try not to use UPS or that kind of courier services, if your package its kind of small and doesnt attracts attention AND if its labeled as gift it should pass customs in a breeze and you might not even pay special taxes, IF you use UPS or something like that you most definetiley will get taxed.
Several mexican vapers agree that HG deliver to Mexico, and in the case your package gets cought in customs you can notify them and they will resend it as soon as possible (i guess they have to verify the info and all that), so our situation is not as bad as it looks.
About building mods, im all for it, im just waiting for my first atty to bust so i cant take it to my friends that specialize in electronics to see what can be done, im currently saving all the info i can regarding atty reconstruction i wish i could see Carlos youtube video about constructing an atty but oh well.
If you can share any kind of info about it (specially with pics) i will be very glad and will thank you deeply.
I guess it all boils down to looks, im not sure, but perhaps you have a higher chance of passing a battery mod (dissasambled might be even better) than a 510 mini with analogs colors. In my opinion there shouldnt be e cigs that use analog colors, im all for the right each one of us has to choose yeah, but it might be healthier to stay as far away from analogs and their image as possible, even with juice names, that just gives more guns to the FDA and our govs, as silly and stupid as it may sound, its true, just MHO.
Good luck Juan, if you have any questions or need any help send me a PM