Im 17,And ive been smoking for about 7yrs now.But these last couple yrs havent been the best for me.I was smoking like 3packs a day last year.Half a yr ago I was smoking 2 packs a day.Now im smoking 1 1/2packs a day.Ive never went to the docter for asthma.But im starting to think I do have it.

have you had any symptoms of asthma?

I know I know.. You've heard it all before... Stop smoking... But really though... you MUST stop if you are having symptoms of asthma. I'm an adult and developed asthma recently and just had to stop. Every time I go back to smoking I seem to have asthma attacks again.. They seem to slowly get worse and worse based on how many cigarettes I have so I am having NONe now. Anyway, you asked If you have Asthma, can you get seizures from it?...
The answer;
Yes. IF the oxygen supply to the brain drops to low from a severe asthma attack you can have a seizure. Your blood oxygen levels would have to drop to below 70/60's.
Are you having seizures? What symptoms have you been having that makes you think you might be having asthma? Remember, there are other lung problems you can get from smoking such as COPD/emphysema, cancer, etc...
If you ARE having seizures, you might just have seizure disorder in which case you would need to see a neurologist to have it checked to be sure.
Grand Mal Seizures would cause asphyxiation but you would also not know what's going on till you came out of the seizure. Most of the time, most people don't recall what just happened when they have this type of seizure. Anyway, if you're smoking as much as you have been then you gotta think... Your lungs are going to be filled with tar & mucus.. 3 packs... You could just be feeling like your drowning in fluids. See a Dr either way and no joke... Lay off the smokes.. Ask the Dr to write you a prescription for the nicotrol inhaler. That will help you to stop smoking. Good luck & take care.... :)