Kevin Smith now weighs under 200 pounds.

The 48-year-old director has been on a mission to lose weight since he suffered a life-threatening heart attack earlier this year, and in a new Instagram post, he revealed he's managed to drop below 200 pounds for ''the first time since High School.''

Posting a picture of himself walking his dog, he wrote: ''The scale said 198 today! This is the first time since High School that I've weighed under 200 pounds! Never... NEVER imagined I could get here again but a heart attack can be a great motivator. (sic)''

The 'Jay and Silent Bob' star went on to thank everyone who has made his weight loss possible, including Weight Watchers - for whom he is an ambassador - as well as his pup Shecky, and several people who have helped him on the path to a plant based diet.

He added: ''This #wwambassador thanks @ww - whose Points system made it possible to drop the lbs! I also wanna thank my little exercise partner Shecky, my Vegan explorer @harleyquinnsmith, @veggiegrill, #pennjillette, @adam_rifkin, @raycroniseand #runyoncanyon! And a big thanks to all you folks who kept me going with your sweet supportive sentiments! Now over the next few months, I'm gonna slowly try to get down to 190! #KevinSmith #ww #weightlosstransformation #WWFamily#wellnessthatworks #WWBros#WWCommunity #ad *People following the Weight Watchers program can expect to lose 1-2lbs per week. (sic)''

Kevin previously dubbed his widow-maker heart attack as the ''best thing'' that has ever happened to his health.

He said earlier this year: ''Down 26 pounds today! Started March 8th and now 4 weeks later, I've lost a small child worth of weight! Doc told me to lose 50 pounds and I'm now over halfway to that goal! Ironically, this heart attack was the best thing that ever happened to my health! (sic)''