I'll take less next time. Do the effects became less after a while? Or do they stay the same?
The effects are the same, depends on how much you take and how your mind takes to it. Weed mostly exaggerates the way your mind is already feeling. My guess - as it was your first time and you took too much, you may have been subliminally worried that what you had taken could be dangerous, and so the symptoms began to materialise. This reached the point where you felt you were having breathing problems because you overdosed.
If these fears were not there, or you learn how to deal with these paranoias when they occur, then this exaggerated negative buzz can be replaced with an exaggerated positive ecstatic buzz.
Gosh, I feel like a drug counselor