Tiffany Finnegan loves what she refers to as her “healthy glow.” The 30-year-old Boston resident is smitten with self-tanning products and regularly applies the lotions and sprays to keep her skin looking beach-resort dark year-round.

Her mother, however, has a different take on her daughter’s tan from a can.

“She makes me crazy whenever she comes home for a visit,” says Joyce Finnegan, who lives outside Syracuse, N.Y. “Between the sprays, lotions and creams, my bathroom has an orange haze when she’s done. The fake tan has become an obsession. She is a ‘tanorexic,’ but we love her, no matter what shade of orange she is.”

That orange hue has become increasingly common as the number of sunless tanning products on the market has risen and as Hollywood stars go under the spray gun. Sales of self-tanners in the United States have skyrocketed in the past five years. In 2003, sales totaled $53 million. By 2008, sales surpassed $200 million, according to market research group Mintel International Group, Ltd. They anticipate those numbers will continue to rise in 2009.

Sunless tanners, which darken the skin by staining the outer layer with dihydroxyacetone, a natural sugar derivative, are safer than lying in the sun or logging time in a tanning bed, says New York dermatologist Jeannette Graf. But there’s an unwanted side effect for those who use too much self-tanner: They wind up as tangerine-colored as Donald Trump. These chronic tanaholics look artificial. President Barack Obama ribbed House minority leader and preternaturally tanned John Boehner at the White House Press Correspondents’ Dinner recently, joking that Boehner “is a person of color, just not a color that is found in nature.”

Overtanning, like obsessive teeth whitening and overzealous eyebrow plucking, is a year-round problem. But in late spring, as women – and plenty of men – prepare for bathing suit season, the number of imitation tans begins to climb as rapidly as the pollen count.

Jimmy Coco, a former Chippendales dancer who now runs a Los Angeles-based spray-tanning business charging $350 a session at a client’s home, says he’s been told by clients who have experienced bad spray tans that they’d rather look artificial than pasty white. In Hollywood, a good spray tan has become as important as the right purse, and tanners such as Coco can charge top dollar because they keep their clients looking sun-kissed rather than dyed.

“I guess orange is acceptable to people, and for the longest time that was the only option,” he said. “In some light that color may look OK, but most of the time it looks really bad.”

Coco, whose client list includes Eva Longoria, Heidi Klum, Victoria Beckham and Katy Perry, says that the current obsession with the artificial tan emerged when Jennifer Lopez began sporting an unabashedly sprayed “bronze goddess” tan five years ago. Not happy to be left looking pale on the sidelines, other celebrities jumped on the bandwagon – with mixed results.

There are a few actresses who maintain alabaster tones – such as Anne Hathaway and Kate Winslet. They are the exception. For years, milky skin was prized, until Coco Chanel made tanning vogue in the 1920s. Before she came back bronzed from the French Rivera, tans were seen as the mark of the working class. Only the wealthy could afford to wile away the days under parasols.

Later, concerns over skin cancer resulted in Coppertone developing the first sunless tanning product in 1960. It was a stink bomb in a bottle that sold poorly and did little to keep people from the beach. The romance of beach movies in the 1960s and a perpetual Beach Boys soundtrack kept baby boomers tanning in the 1970s and 1980s, Coco said.

Celebrity makeup artist Brett Freedman, whose clients include Reba McEntire, Kelly Clarkson, and Vanessa Hudgens, said sunless tanaholics just don’t know when to stop spraying, smearing, and bronzing.

“There are people who think that they can never be too thin or too blond,” said Freedman. “And then there are people who think that they can never be too tan. The problems you see with these tans now is that there are people who want as much color as possible, so they’ll pick a product that has way too much pigment in it, and apply it as often as possible.”

“There’s a general perception that a tan means you’re healthy,” she says Boston psychiatrist Lenore Cantor. “And for people who don’t like their appearance, getting a tan is sometimes seen as a quick fix. Of course the irony is that spending too much time in the sun is anything but healthy.”

While sunless tanning is safer for skin than lounging in the sun or baking in a tanning bed, dermatologist Jeanine Downie says that she does not recommend spray tans for people with asthma or respiratory infections, because they can trigger asthma attacks. For home tanning, she said she has seen some people put self-tanner too close to their eyes and wind up with conjunctivitis. She’s also seen patients ruin some very nice towels.