 It is a warning we hear every year. Have a blast on the 4th of July, but leave fireworks to the professionals. State Fire Marshal John Devine says fireworks are inherently dangerous and possessing or using them in Massachusetts requires licensing and certification. Over the past five years, fireworks have caused 532 fires and explosions, about a million and a half dollars in property damage, and more than 200 serious injuries in Massachusetts requiring treatment in a hospital emergency department.