以下详细说明暂以英文提供。
The daily math
Packs are sold in twenties, so cigarettes per day ÷ 20 gives packs per day, and that times your pack price is the daily burn. The calculator spreads it across the week, the month, and a 365-day year — a half-pack a day at $8 a pack is a quiet $4 daily, $28 weekly, and $1,460 yearly. Because prices rise faster than most incomes, the yearly figure tends to creep up between one shop and the next.
What the years add up to
Enter how long you have smoked and the long-run total appears — small daily amounts are excellent at disguising large lifetime ones. The streaming comparison is just one lens on that number: the same money at $15 a month buys years of subscriptions, a flight, or a serious dent in a savings goal. It is not a lecture or a promise about what you should do, only a clear look at what the habit currently costs — and what else it could be.
中国本地参考
日常计算时值得知道的中国本地规则：
- 计量的单位习惯: 住房面积用平方米，土地常用亩（1 亩 ≈ 666.7 平方米）；里程用公里，油耗用 L/100km。
- 日期与数字格式: 日期写作 2026年10月13日（年-月-日）；大数习惯用万、亿（1 万 = 10,000，1 亿 = 100,000,000）。
- 法定节假日: 全年法定节假日 11 天，春节与国庆为长假；调休安排每年由国务院办公厅发布。
- 速度与限速: 高速公路最高限速 120 km/h，城市快速路多为 80 km/h，均以公里每小时计。
- 鞋服尺码: 鞋码用中国码（毫米制），服装常用 155/80A 这类身高围度组合，与欧美码不同。
数据核对：2026 年 10 月
常见问题
My pack has 25 cigarettes — what price do I enter?
Convert it to a 20-pack equivalent: multiply your pack price by 20/25 (0.8). The math then stays consistent with the cigarettes-per-day figure you entered.
Does this include lighters, insurance, and other extras?
No — it counts cigarettes only. Smokers typically also pay more for life and health insurance, more frequent dry cleaning, and dental care, so the true total runs higher than the rows above.
Where does the streaming comparison come from?
It divides the annual (or lifetime) total by $15 a month, a typical single-screen streaming subscription, and shows how many years that would fund. It is one relatable benchmark rather than a recommendation of what to buy.