It's always good to err on the side of caution. Legislation is always going to follow research by a long ways, and the research on this stuff is just getting started. Long-term effects, as you note, take a while to manifest themselves. So if you wait to be prohibited from harming yourself with chemicals, it will likely be too late by the time you stop. So if you want to melt ABS and other potentially toxic plastics at home, do it in a room that's separate from your living space and provided with adequate ventilation.