2013 Toyota Camry Hybrid needs new tires already?!

the civic i leased had tires with poor winter traction so i got a 2nd set of used rims/snow tires and it was much better driving. that let me put the 1st set on the shelf for 1/2 the yr. they were at minimum tread when 4yr lease ended. i figure they had 35k miles. than i sold the snow tires for more than i paid.