Weekly cost is the most useful framing for most smokers, because it matches how money actually leaves your account — even if you buy monthly.
The arithmetic
A pack a day is seven packs a week, or 0.7 cartons. Multiply your pack price by seven, or your carton price by 0.7.
| Pack price | Per week | Per month | Per year |
|---|---|---|---|
| $6 | $42 | $182 | $2,190 |
| $8 | $56 | $243 | $2,920 |
| $10 | $70 | $304 | $3,650 |
| $13 | $91 | $395 | $4,745 |
Where the state spread puts you
In a low-tax state at $6 a pack, about $42 a week. In a high-tax state or city at $13, about $91. Same habit, more than double the cost.
What the carton channel changes
At $69.90 a carton, a pack-a-day smoker spends about $49 a week — equivalent to a $7 pack. That is a large saving in a $12-per-pack state and a loss in a $6-per-pack state.
Our break-even piece has the full table.
Half a pack a day
Halve everything: seven packs a fortnight, or 1.5 cartons a month. At $70 a carton that is about $25 a week.
Two packs a day
Double: 1.4 cartons a week. At $70 that is about $98 a week, roughly $425 a month.
Why the weekly number is worth knowing
Because it makes the tax gap concrete. The difference between a $6 and a $13 pack is $49 a week — about $2,550 a year. That is not a rounding error, and it is entirely determined by where the cigarettes are bought.
It also makes the carton decision easier: compare the weekly figure, not the headline carton price.
Build the number from three parts
A weekly cigarette cost has three inputs: how many cigarettes you smoke per day, the price you pay per cigarette, and how many days you buy for. Most people know the first and guess at the second. The second is where the money is, because the gap between the cheapest and most expensive way to buy the same cigarette is often 60 percent.
Start with the price per cigarette rather than the price per pack. A $7.99 pack is 40 cents a cigarette. A $69.90 carton is 35 cents. A $130 New York carton is 65 cents. Multiply by your daily count and by seven.
Four profiles, worked through
Half a pack a day at 35 cents: 10 cigarettes times 35 cents times 7 equals $24.50 a week. A pack a day at the same price: $49. A pack and a half: $73.50. Two packs: $98.
Now run the same four at 65 cents, which is roughly what a high-tax city counter charges. Half a pack: $45.50. A pack: $91. A pack and a half: $136.50. Two packs: $182. The smoking habit did not change between those two paragraphs. Only the price per cigarette did, and it doubled the weekly cost.
What that means over a year
The pack-a-day smoker at 35 cents spends about $2,548 a year. At 65 cents, about $4,732. The difference, roughly $2,184, is more than most people spend on a holiday. That is the number worth reacting to, and it is the reason the carton channel exists at all.
Our break-even piece shows how many packs you need to buy at once before the carton price beats the counter price, and this one converts a carton into days.
The costs people leave out
Three. Shipping, which on a single carton can add $10 to $20 and change the per-cigarette maths. Waste, because the last few cigarettes in an open pack go stale if you smoke slowly. And the format effect, which is the one almost nobody accounts for: a super-slim burns faster than a king-size, so a carton of slims can cost more per week than a cheaper-per-carton box of kings even though the carton price looks lower.
If you smoke slims, add roughly 15 to 25 percent to your daily count to get the equivalent tobacco, then run the arithmetic again.
Is the weekly number even the right number
For budgeting, yes, because it is the figure that matches how often you buy. For deciding whether to switch brands, no. The right number there is cost per cigarette at the strength you actually smoke, since a 5mg slim and a 14mg full-flavour are not interchangeable units. Comparing a $59.90 slim carton to a $79 full-flavour carton on price alone will tell you the slim is cheaper when it may cost more per week.
Smoke what you smoke, then optimise the price of that. Optimising by switching to a weaker cigarette usually just means smoking more of them.