Only for specific personalities. I'm somewhat prone to Dota addiction, but 14 out of the 15 people I play with are not, and in both my case and that 15th person we've managed it with some difficulty.
For most people it won't be an issue - you're far more likely to not enjoy the game at all.
For most people it won't be an issue - you're far more likely to not enjoy the game at all.