MADISON, NJ—Chris Becker, bartender at the Silver Nickel tavern, said he was growing increasingly worried about his growing tolerance for alcoholics. "A little used to go a long way, you know? I could last all night on one long, drawn-out tale of self pity, with maybe a brawl between two patrons as a nightcap," said Becker, who has been taking in at least four alcoholics a night since getting his license in 1996. "But lately, it's been taking nine, 10, sometimes 15 of them to make me feel anything at all." Alcoholism tolerance has long been recognized as a problem in the hospitality industry, and experts warn it can lead to bartenders developing unhealthy tolerances for smokers, drug users, and sex addicts.