Most woods are arguably safe unless chewed or sucked but it is the 1% of people who have an allergy that we have to think about. Most of the danger is from the dust etc as said but IMHO better safe than sorry especially if someone did become ill from simething I made I am legally liable, even if I gifted it to them. Laburnum, yew, walnut can be a problem for those with extreme nut allergies, iroko, teak, in fac=t most oily woods as the oil can seep into the food. Best better are all the acers, beech, and some indigenous ones such as hawthorn, fruit trees blackthorn,
Pete