Why am i so pissed at everybody lately?

this has been happening for like a week or so now, some one just looks at me wrong or says something stupids or makes a stupid gesture i just get pissed an very irritated...i don't get it i smoke an its like when u go so long with out one thts how u act been iv been smoking alot lately an they rnt helpin me like they used to wht clud be wrong with mt