Great Question, however, I am not a "compounding pharmacist"(although all pharmacists can technically compound-and I do on occasion compound very simple ointments and creams). However, an acquaintance of mine Tom owns Dorneyville Pharmacy, which is a Compounding specialty pharmacy(it's literally ALL they do) He sold his regular non-compounding script business to a local Rite Aid. Looking at my jobber catalogue, I don't even see an option for me to order Nicotine,USP in any percentage. However, my jobber catalogue, as I said, is not a specialty compounding catalogue. So the only nicotine I see that I would be able to order comes in the regular NRT marketed products. However I know compounding pharmacists can obtain nicotine, as there was an article in a journal I was reading a few years ago about a compounding pharmacist who made Nicotine lollipops. With the FDA now regulating nicotine as a drug, however, I question if that is even legal anymore. But I know that the answer to your question already is, most likely , NO. The reason being your writing a script saying specifically every 3 hours for VAPORIZATION. There is no approved medical device to vaporize(except and this is a stretch , a nebulizer which is not approved for nicotine use) and therefore LEGALLY it could not be compounded. You asked practically, well practically as long as you can get the ingredients from a supplier(which I will contact Tom about the nicotine to make sure) you could physical make the compound. I mean PG is easily obtained. Another legal issue that pops up is that you are clearly stating "for withdrawal symptoms". This reminds me of the methadone federal law that states a physician can only write a methadone Rx if it specifically states "for severe pain" on the Rx. Otherwise, it must be dispensed by a registered methadone clinic for maintenance or withdrawal of addiction. Since the only Nicotine products approved for "withdrawal" are the marketed NRT's the Rx you describe is illegal in that respect as well. So I guess the ultimate answer to your question is , if the Nicotine is available to a pharmacy from a supplier, YES, practically you could compound the script. But since it would be illegal for the pharmacist to dispense it, I don't think the Pharamacist would. I certainly could do it easily if I could order the Nicotine, but I wouldn't do it because I know it would be illegal to dispense. At this point, to my knowledge, the only Nicotine that is legal to market is Tobacco products(to adults over the age of 18) and approved NRT's. And as I mentioned I am a vaping pharmacist as well and I feel this will change dramatically in the next few months to years.