As for e-liquid, it serves as the base of the whole formulation, diluting other ingredients to the desired strength of the manufacturers
Among students who reported they were currently using a tobacco product, 72.8% of high school students and 59.6% of middle school students reported using flavored products, including: 68.8% of current e-cigarette users, 46.7% of current cigarette smokers, 41.9% of current cigar smokers, 48.0% of current smokeless tobacco users, 31.2% of current hookah users, and 31.4% of pipe tobacco users
In battery saver mode, the battery will last longer since the power output is lower on this mode
So, packaging plays a big role in the cigarette price

[467] In a March 2014 letter to Human Rights Watch, Universal stated that it has agreed with the fundamental positions contained in the International Labor Organizations Convention 138 on minimum age and Convention 182 on the worst forms of child labor. [468] Universal acknowledged that its approach presents challenges as many regions around the world have conflicting laws about minimum age or the definitions of child labor and hazardous work (or there are no laws at all). [469] Universal states that in its contracts with tobacco growers in the US it expressly forbids our growers to employ workers under the applicable minimum legal age for the specific work performed. [470] Universal also noted, as have some other tobacco manufacturing companies whom Human Rights Watch contacted in conjunction with this report, that it has limited agronomy personnel for support, training, and monitoring of its contracted growers in the US and that universities agricultural extension services fulfill these functions

Yellow fingers from smoking are not pleasant to look at, but they are usually just a cosmetic problem