On using a Capacitor, Resistor simple circuit as analog computer in order to reduce cigarette or other addition dosage

At your risk.

Keep voltages below say 30 volts for safety.

When a charged capacitor is discharged by a resistor the voltage reduction is inverse exponetial with half time (the time taken for a quantity to become half, here voltage)  equal to R times C.

So if the right values of C and R are found to give dosage for every second representing say each day and the capacitor is initially charged with so many volts representing current number of cigarettes...

Then with a high impedance voltmeter we can read voltage every each second representing every subsequent day's cigarette dosage for a smooth reduction. Highest dosage decrease is the first day. 

In this context here half time means the time needed for cigarette dosage to become half. Say 20 days for daily cigarettes to become from 100 to 50, another 20 days for number of daily cigarettes to become from 50 to 25 etc.

Further reading RC circuits, time constant, electromagnetism books etc.