First sorry for your loss I lost my aunt almost 2 years ago (can't believe it's been that long) to smoking and it def changes yoru outlook on smoking and how you treat your body. To answer your question a good starting point in my opinion is 18mg-12mg of nicotine if your sensitive to chemicals and what not def stick with vg or even better 20/80 pg/vg. The nicotine content will change how harsh the vapor is on your throat more so than anything so the lower the nicotine the smoother the vape however the trade off is your cravings could be pretty hard if you start at 12mg depending on your current nicotine intake. Getting a liquid that perfectly mimics a cigarette is almost impossible but it is possible to get something close enough to work. I was a marlboro menthol smoker and the best thing I came up with was a mix of halo true pure, halo menthol ice, ave 555, ave flue cured, and a hint of gorilla
juice just to give it a little flavor (this can not be added if you don't want it). The best thing to do is try different menthols not sure who carries them bc I have always stuck with halo for menthol. Honestly the best thing to do is just try different juices in sample for till you find waht tastes the best. AVE has some awesome juices but no menthol, instead you buy a
tobacco that you want and then add menthol drops to get it perfect but beware the drops are STTRRROOONNNGGG. some good
juice places IMO are copper creek, ave, halo, vaperite has some good flavors as well as vape dudes. Like i said the best I came across was the mix I listed earlier in this post, if I were you I'd try it it will also give you the chance to try several different flavors while making one really good menthol