Chronic stress can cause the immune system to work poorly, causing sores due to opportunistic pathogens infecting the oral cavity
The only proven risk reduction comes from complete tobacco cessation
(Im addressing mostly classic shapes, here, with the idea that most examples of any classic will have fairly similar bowl geometries
A meta-analysis from 2018, conducted on 61 RCT, showed that one year after people quit smoking with the assistance of firstline smoking cessation medications (and some behavioral help), only approximately 20% of them sustained abstinent, as compared to around 12% who did not take medication
Halitosis, diminished taste and smell acuity are common side effects of smoking
As of 2018, the cheapest available RYO pouch was very similar in price to the cheapest FMC pack of 20 cigarettes, however, a 15-gram pouch would yield 5 more cigarettes per pack if rolled with 0.6 grams of tobacco each, or 10 more cigarettes per pack if rolled with 0.5 grams