Not quite as clear cut as that. Depends on your teeth which depends on your genes and environment.
I love coffee but can't stomach more than one cup a day as the caffeine does me in. This puts me in a different pool of people than frequent coffee drinkers which is apparently at a higher risk of cancer. This isn't the same as saying drink more coffee and have less cancer.
Seems to me that the simple solution is to change the model in the US to the one that the rest of the world uses. I.e If I call a cell phone I pay for the call. If someone calls me they pay for the call (or use their allocated minutes). Cell phones have different area codes to landlines so you know you are calling a cell phone.
Seems a completely fair system to me. The concept of the person recieving the call paying is just warped and open to abuse.