tambaakoo dhoomrapaan ek aisa abhyaas hai jismein tambaakoo ko jalaaya jaata hai aur usaka dhuaan ya to chakha jaata hai ya fir use saans mein kheencha jaata hai. iska chalan 5000-3000 E.poo.ke praarambhik kaal mein shuroo hua.[1] kai sabhyataaon mein dhaarmik anushthaanon ke dauraan ise sugandh ke taur par jalaaya gaya, jise baad mein aanand praapt karne ke liye ya fir ek saamaajik upakaran ke roop mein apnaaya gaya.[2] puraani duniya mein tambaakoo 1500 ke dashak ke antim daur mein prachalit hua jahaan isne saajha vyaapaarik maarg ka anusaran kiya. haalaanki yeh padaarth aksar aalochna ka shikaar banta raha hai, lekin iske baavajood vah lokapriya ho gaya.[3] jarman vaigyaaniko ne aupachaarik roop se der se 1920 ke dashak ke ant mein dhoomrapaan aur fefade ke Cancer ke beech ke sambandhon ki pehchaan ki jisse aadhunik itihaas mein pehle dhoomrapaan virodhi abhiyaan ki shuruaat hui. aandolan tathaapi dviteeya vishv yuddh ke dauraan dushmanon ki seema mein pahunchane mein naakaam raha aur uske baad jald hi alokapriya ho gaya.[4] 1950 mein svaasthya adhikaariyon ne fir se dhoomrapaan aur Cancer ke beech ke sambandh par charcha shuroo ki.[5] vaigyaanik pramaan 1980 ke dashak mein praapt hue, jisne is abhyaas ke khilaaf raajaneetik kaarravaai par jor diya. 1965 se viksit deshon mein khapat ya to ksheen hui ya fir usamein giraavat aayi.[6] haalaanki, vikaasasheel duniya mein badhat jaari hai.[7]
ek laujik gate ki "vishvasaneeyata", asafalata (MTBF) ke beech uske ausat samay ka varnan karti hai. digital masheenon mein aksar laakhon laujik gate hote hai. iske alaava, adhikaansh digital masheenon ko unki laagat ko kam karne ke liye "anukoolit" kiya jaata hai. nateeja saaf hota hai, ek ekal laujik gate ki vifalta, ek digital machine ke kaam band karne ka kaaran banegi.
lekin, January 2009 mein saims club ne paalan na karne par lagne vaale jurmaane ko kaafi kam kar diya, jise usane prati pailet $2 se ghataakar sirf 12 seint prati pailet kar diya. Wall-Mart ka anumaan hai ki saims ke liye khud taiging karne par prati pailet 12 seint ka kharcha aaega. saims ne yeh bhi ghoshana ki ki pailet-stareeya taiging ko 2010 mein poori shrrunkhala bhar mein shuroo kiye jaane ki ummeed hai, jabki vyaktigat vastu par taiging ki samay seema "vichaaraadheen" hai.

iski tulana mein atulyakaalik system ka design bahut kathin hota hai kyonki sabhi sambhav samay mein bhi sambhaavit state ka vichaar kiya jaana chaahiye. nyoonatam aur adhiktam samay ke table ke nirmaan ke sabse saamaanya vidhi ke anusaar ismein saare state vidyamaan ho aur vaise state ke mineemaaij ke liye sarkit ko samaayojit kiya jaata hai aur jo iske sabhi hisson ke susangat state mein samay-samay par jaane ke liye sarkit ko baadhya kare. (ise "self-reesinkronaaijeshan" kaha jaata hai.) aise saavdhaan design ke bina sanyogavash atulyakaalik laujik ka utpaadan karna aasaan hai jo "asthir" hai aur vaastavik electronics hai jismein apratyaashit parinaam hote hain kyonki electronic upakaranon ke moolyon mein chhote badlaavon ki vajah se sanchit vilamb hota hai. kuchh sarkit (jaise sinkronaaijr-flip flop, svich debaaunsar aur jo baahari anasinkronaaijd ko atulyakaalik laujik sarkit mein pravesh karne ki anumati deta hai) sahaj roop se apne design mein antarnihit atulyakaalik rahe hain aur is tarah hi vishleshan kiya jaana chaahiye.
iske vipreet, kuchh gair-vaigyaanik adhyayan hain jismein se ekcheck ganaraajya ke Phillip mauris[72] dvaara aur doosra kaato Institute dvaara kiye gaye hain,[73] jo vipreet sthiti ka samarthan karte hain. adhyayan ki na to saathiyon dvaara sameeksha ki gayi aur na hi kisi vaigyaanik patrika mein prakaashit kiya gaya aur kaato Institute ko ateet mein tambaakoo companiyon se dhan praapt hua tha.[krupaya uddharan jodein] Phillip mauris ne spasht roop se apne poorv ke adhyayan ke liye yeh kehkar maafi maangi hai ki: "is adhyayan ke liye dhan aur saarvajanik vigyapti mein anya baaton ke alaava dhoomrapaan karne vaalon ki samay se pehle hone waali mauton se check ganaraajya ki vistrut kathit laagat bachat ki baat ek ek bhayaanak nishkarsh hai, saath hi saath vah poorn roop se buniyaadi maanaveeya moolyon ki upeksha hai, jo asveekaarya hai. hamaari tambaakoo companiyon mein se ek ne is adhyayan ka kaaryabhaar diya tha, jo ek bhayaanak galati naheen thi, balki vah anuchit tha. Phillip mauris mein ham sabhi, yeh koi maayane naheen rakhata ki ham kahaan kaam karte hain, is kaarya ke liye kshamaapraarthi hain. vaastav mein dhoomrapaan se koi faayda naheen, uske kaaran gambhir aur mahatvapoorn rog hote hain."[72]
design ke aadhaar par, EPCglobal Network bhi Dos hamlon ke prati kamzor hai. EPC deta anurodhon ko hal karne mein DNS ke saath aisi hi pranaali ka upayog mein, ONS root sarvar Dos hamle ke liye asurakshit ho jaate hain. EPCglobal Network ke saath shuruaat karne ki yojana bana raha koi bhi sangathan yeh gyaat hone par thithur jaaega ki EPCglobal Network ke buniyaadi dhaanche mein DNS ke samaan hi suraksha kamjoriyaan hain.

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