Fewer radioactive waste products than fission Drawbacks of fusion 1. That is, nobody yet knows how to make the plasma stay put in one place. Current research is studying super-conducting electromagnets, that would create intense magnetic fields to trap the charged plasma particles. These neutrons would smash into any atoms in their path. Hence the two phenomena of neutron embrittlement and induced radioactivity of the reactor structure.
Any fusion reactor is likely to be very big, very complicated, and very, very expensive.