Csharp

anybody else get these alot? idk why but when i first smoked,even though i didnt do it as often,i could smoke as much weed as i felt like,and still be fine.
but then i quit for about 2 years,and now i started doing it regularly since october,like every day,but now if i smoke,not even a real big amount(like half a bowl) i will get a panic attack.that easily,im guessing its because my stress has increased over those past two years.but anyone else have any sugestions why this might happen so much now?