sentences:  Although the promise of not drinking alcohol and gambling while under the age of 21 was not valuable consideration (it was already legally prohibited), most states allow smoking by age 18 and swearing, while some consider it vulgar, is not illegal at any age.Even though smoking is legally restricted until age 18, it is legal for those above 18, and thus the promise to forbear from it entirely has legal value.However, the uncle would still be relieved from the liability if his nephew drank alcohol, even though "that" consideration is valueless, because it was paired with something of legal value; therefore, adherence to the entire, collective agreement is necessary.