I will always think the same thing, back in 2013 with all the Richie tension and later Tico's surgery, he started smoking again, he smoked for a lot of years, when you are smoker and you quit and you go through a huge emocional stress, your body just craves nicotine, you may not use it but I think he did. The cigarrettes plus his depression, I think just made him shot his voice, as far as I know, the vocal chords of a singer are like strings on a guitar, if you don't play, they go out of tune, Jon said that he couldn't sing anything for months in one of the Runaway Trips...