Smoking Cost/Vaping Saving calculator

Purpose: Demonstrate the cost of smoking to smokers.
Outcome: A simple calculator using brand colours that will enable a smoker to enter the cost of cigarettes and see the cost of smoking by day, year and life, and also

Programming: We should be wary of using anything that executes PHP on the embedded sites server/hosting as not everyone will have permission to run it (eg s3 buckets/non vps hosts)

Key attributes:

Calculator must be embeddable on wordpress, with code to provide.
Simple and easy to use.
Display results.

Variables to enter:

Age: (in years, rounded to nearest year, no decimal input)
Cigarettes per day:
Cost: Default or Enter

Desired outputs
Number of years until death (reworded, based on average lifespan 81.6 years)
Savings
Per Day (constant, based on defaults or provided value)
Per Week (constant, based on defaults or provided value)
Per Year (constant, based on defaults or provided value)
In your lifetime (based on age)

Other controlling factors:

Cost of smoking cheapest cigarette: 39.9p per cigarette [Rothman’s]
Cost of vaping: 61p per day according to press release calculations.
Average lifespan in the UK. [81.6 years: https://www.google.co.id/publicdata/explore?ds=d5bncppjof8f9_&met_y=sp_dyn_le00_in&hl=en&dl=en]

Results to display:

Cost of cigarette by day, year and life.
Equivalent cost of vaping by day, year and life. .
Vape saving by day, year and life.