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 |
| Holborn and St Pancras | O'DONNELL, Shane | 86,764 | 63.3% | 252 | 0.5% | - | 6th |
| Hackney South and Shoreditch | BIRCH, Paul | 84,971 | 56.0% | 297 | 0.6% | - | 7th |
| Camberwell and Peckham | ROBERTSON, Alex | 82,746 | 62.3% | 197 | 0.4% | - | 9th |
| Bethnal Green and Bow | DEWEY, Jonathan | 82,727 | 64.0% | 303 | 0.6% | - | 8th |
| Vauxhall | JENSEN, Louis | 82,231 | 58.3% | 164 | 0.3% | - | 8th |
| Esher and Walton | HEENAN, Matt | 79,894 | 71.3% | 396 | 0.7% | - | 6th |
| Streatham | BEAST, Artificial | 79,137 | 63.1% | 192 | 0.4% | - | 6th |
| Thurrock | BARNES, Jamie | 77,559 | 63.9% | 244 | 0.5% | - | 5th |
| Guildford | SMYTH, Gerri | 75,733 | 71.3% | 196 | 0.4% | - | 8th |
| Woking | WADE, Declan | 74,269 | 70.0% | 229 | 0.4% | - | 6th |
| Wakefield | BARR, Elliot | 70,521 | 60.9% | 283 | 0.7% | - | 7th |
| Sheffield South East | BATTERSBY, Jen | 70,422 | 59.2% | 207 | 0.5% | - | 6th |
| Great Yarmouth | TOWNLEY, Sam | 69,793 | 63.7% | 167 | 0.4% | - | 6th |
| Eddisbury | ANTAR, George | 68,569 | 69.1% | 301 | 0.6% | - | 6th |
| Islington South and Finsbury | KIRTON, Jay | 68,127 | 65.0% | 309 | 0.7% | - | 6th |
| Leeds West | WEST, Matthew | 64,950 | 59.2% | 217 | 0.6% | - | 6th |
| Kensington | AUGUSTE, Tony | 61,133 | 57.0% | 211 | 0.6% | - | 6th |
| Cities of London and Westminster | DESFORGES, Edouard-Henri | 60,992 | 59.3% | 160 | 0.4% | - | 6th |
| Stoke-on-Trent Central | MAJID, Ali | 60,634 | 51.3% | 244 | 0.8% | - | 7th |
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.