That's why a visit to the Dr should be the first step.
The side-effects from replacement therapy is infinitely smaller than that of tobacco and the best results by far are with people who use replacement therapy.
There is also a drug which acts like nicotine, but it has some potentially fatal psychological effects. (
Varenicline)
Sorry, I should have expanded on the earlier comment, but I was in a bit of a hurry.
They're heavily subsidised here, but either way, they cost a fraction of cigarettes.
One other thing which may be worth trying - for some idiotic reason they are banned here -
Swedish snus.
While they are by no means "safe", they are much, much safer than smoking.