Not a good idea. Nicotine gum is not too good for gingival health. Nicotine patch is consider the safest form of nicotine delivery. Also the most expensive. E-cigarette is a good 2nd option. Vape unflavored or menthol, because the health effects of flavorings are still out there. Vendors have mostly stopped using diacetyl in their flavorings. Diacetyl gives that vanilla aroma, but also responsible for popcorn lung. Still they're using acetoin which could convert to diacetyl in small amount uncertain conditions. There's also the issue of vegetable glycerin (used as a carrier) converting to acrolein under high heat. I think this is a non issue if you don't let your atomizer gunk up, which inhibits heat transfer from the coil.

I'm alarmed at the ubiquitous use of aldehydes in flavorings. Most of these have no solid research proving the safety.

If money is not an issue, I would use the patch everyday instead of e-cig.

Nicotine, I've found, is the only sustainable option in the long run. Methylphenidate, amphetamines, other dopaminergics, caffeine, modafinil, they all poop out eventually.

I'm also convinced that nicotine is the safest and most effective nootropics known at the moment until cortex gets around to releasing their ampakine. The structures of which are all under secret, so we self-experimenters can't even get it custom synthesized.