does anyone have good ideas on how to quite smoking?

i am heavily into singing, and broadway, im very musical. but i started smoking, not realizing the reprocussions and now it has become an addiction and a problem, i want to quite i have tried cold turkey... but it hasnt worked... the withdrawls are overwhelming.... and as many may know, i cant get any air because of it... does anyone know an effictive way to quite? please i drasticly need help!