The former Bordeaux striker has already found the net on 10 occasions since his summer switch.
Speaking ahead of Saturday's clash with Fulham, he told The Sun: "I told myself I would need a year or two to be up to scratch.
"I used to read articles about former French league players who were abroad, about their struggles. I knew I would be homesick when I left my cocoon in Bordeaux.
"But I didn't cost the club anything. If I had been bought for £18million, different things would have been expected from me at the start.
"I was lucky that two centre-forwards from last season got injured (Van Persie and Bendtner). I played and profited from that.
"Points are so valuable here that you have to force yourself to be a killer.