Use the first option ("Present Perfect in the Future", or "Future Perfect"; terminology varies)...

1: If you give me a cigarette it will be the first time I have smoked since I quit
...as opposed to "standard" Present Perfect referring to the actual Past...
2: He gave me a cigarette. It was the first one I have smoked since I quit

Use the first option ("Present Perfect in the Future", or "Future Perfect"; terminology varies)...

1: If you give me a cigarette it will be the first time I have smoked since I quit
...as opposed to "standard" Present Perfect referring to the actual Past...
2: I just had a cigarette. It was the first one I have smoked since I quit

Use the first option ("Present Perfect in the Future", or "Future Perfect"; terminology varies)...

1: If you give me a cigarette it will be the first time I have smoked since I quit last year
...as opposed to "standard" Present Perfect referring to the actual Past...
2: He gave me a cigarette this morning. It was the first one I have smoked since I quit

Use the first option ("Present Perfect in the Future", or "Future Perfect"; terminology varies)...

1: If you give me a cigarette it will be the first time I have smoked since I quit
...as opposed to "standard" Present Perfect referring to the actual Past...
2: He gave me a cigarette. It was the first one I have smoked since I quit