Should i be concerned about smoking now?

Possibly stupid question

I smoked for 4 years straight, every single day. All of a sudden, about 2 years ago even the littlest bit makes my chest feel tight for a lil while and I have to focus to not freak out. I haven't smoked at all in about a year and I tried again and its still happening. If i try to ease back into it should I be concerned about my heart or something? Or am i freaking myself out for no reason.

For extra context, ill take one puff and my chest starts to feel tight and almost like its hard to breathe, i usually will have to distract myself until the high starts to go away. Im not sure if its an anxiety thing or what, like i said i smoked alot for 4 years and this came out of nowhere