People may see anyone who gamble excessively to be addict, but in the end, it all depends on the individual and what they want from the active game involvement, but the chances of sliding into an addiction truly since he will be gambling excessively just to meet the set income and on a steady basis.
I know my friend too well that most times, his always analyzing one match or the other and do me he behaves more like an addict but wouldn't have to call him such because his doing very well for himself through same addiction.
Successful gamblers set target and worked towards their target thus not necessarily being an addict probably they set a weekly or monthly target and win consistently though losses are inevitable, once those targets are met some will take a break, they analyze their bets and pick sure ones and stake their money, however in a long run profits accrued overtime outweigh losses, personally I believe addicted gamblers are those who gamble to become rich quickly unfortunately ended up getting rekted, while some addicted won't quick until they believe they can recover their losses, however successful gamblers don't have that kind of mindset.