Results for the UK general election on 7 May 2015 England - Elections contested by Cannabis Is Safer Than Alcohol
| Constituency | Candidate | Electorate | Turnout | Votes | Vote share | Vote change | Position |
| Bethnal Green and Bow | DEWEY, Jonathan | 82,727 | 64.0% | 303 | 0.6% | - | 8th |
| Camberwell and Peckham | ROBERTSON, Alex | 82,746 | 62.3% | 197 | 0.4% | - | 9th |
| Cities of London and Westminster | DESFORGES, Edouard-Henri | 60,992 | 59.3% | 160 | 0.4% | - | 6th |
| Eddisbury | ANTAR, George | 68,569 | 69.1% | 301 | 0.6% | - | 6th |
| Esher and Walton | HEENAN, Matt | 79,894 | 71.3% | 396 | 0.7% | - | 6th |
| Great Yarmouth | TOWNLEY, Sam | 69,793 | 63.7% | 167 | 0.4% | - | 6th |
| Guildford | SMYTH, Gerri | 75,733 | 71.3% | 196 | 0.4% | - | 8th |
| Hackney South and Shoreditch | BIRCH, Paul | 84,971 | 56.0% | 297 | 0.6% | - | 7th |
| Holborn and St Pancras | O'DONNELL, Shane | 86,764 | 63.3% | 252 | 0.5% | - | 6th |
| Islington South and Finsbury | KIRTON, Jay | 68,127 | 65.0% | 309 | 0.7% | - | 6th |
| Kensington | AUGUSTE, Tony | 61,133 | 57.0% | 211 | 0.6% | - | 6th |
| Leeds West | WEST, Matthew | 64,950 | 59.2% | 217 | 0.6% | - | 6th |
| Sheffield South East | BATTERSBY, Jen | 70,422 | 59.2% | 207 | 0.5% | - | 6th |
| Stoke-on-Trent Central | MAJID, Ali | 60,634 | 51.3% | 244 | 0.8% | - | 7th |
| Streatham | BEAST, Artificial | 79,137 | 63.1% | 192 | 0.4% | - | 6th |
| Thurrock | BARNES, Jamie | 77,559 | 63.9% | 244 | 0.5% | - | 5th |
| Vauxhall | JENSEN, Louis | 82,231 | 58.3% | 164 | 0.3% | - | 8th |
| Wakefield | BARR, Elliot | 70,521 | 60.9% | 283 | 0.7% | - | 7th |
| Woking | WADE, Declan | 74,269 | 70.0% | 229 | 0.4% | - | 6th |
Turnout as calculated by the House of Commons Library, is the total number of votes cast and not spoiled, divided by the size of the electorate.
Under section 13(b) of the Representation of the People Act 1985, a candidate gaining 5% or less of the vote share will forfeit their deposit.