"I was at MK Dons last year doing well and then joined Leeds, but on the day I got there Simon Grayson was sacked, so that changed everything for me," the 21 year old told Sky Sports.
"It wasn't the ideal situation for me, but I've managed to earn another shot at the Championship this year and I feel that I'm doing well at this level.
"The next step for me is obviously the Premier League, but the only way I'll get to that stage is continuing to work hard and show my ability whilst here at Millwall."
Smith has credited the locality of the club for his good form.
"The chance to live at home and not move around the country was a huge bonus when opting to join Millwall because it can take a while to settle when you have to uproot to a different place and new surroundings," Smith continued.
"Millwall is a great club and I have enjoyed my time immensely and long may it continue."